National Health and Nutrition Examination Survey

2017-2018 Data Documentation, Codebook, and Frequencies

Sexual Behavior - Youth (SXQY_J_R)

RDC Only Data File: SXQY_J_R.xpt

First Published: July 2020

Last Revised: NA

This dataset is not available publicly. Access may be obtained through the NCHS Research Data Center (https://www.cdc.gov/rdc).

Component Description

The Mobile Examination Center (MEC) Interview section on sexual behavior (variable name prefix SXQ) provides information on lifetime and current sexual behavior for both male and female. Items covered in this section included: age of first sexual encounter, number of sexual partners, sexual identity, circumcision status (male), and history of sexually transmitted diseases.

Eligible Sample

Survey participants aged 14-69 years were eligible. Several questions in this section are age-specific, and many are gender-specific. Mentally impaired participants or participants who were unable to understand English, Spanish, Korean, Vietnamese, or Chinese (traditional/Mandarin, simplified/Mandarin, and traditional/Cantonese) were not asked these questions. Only data from participants aged 14-17 years old are included in this file. Data from participants 18-69 years are available in a separate dataset: Sexual Behavior - Adult (SXQ_J_R). Both datasets may be accessed through the NCHS Research Data Center (RDC).

Interview Setting and Mode of Administration

The sexual behavior questions were self-administered in a private room at the MEC, during the MEC Interview, using the Audio Computer-Assisted Self Interview (ACASI) system. The ACASI was conducted in one of the following languages: English, Spanish, Korean, Vietnamese, or Chinese (traditional/Mandarin, simplified/Mandarin, and traditional/Cantonese). The ACASI enables respondents to hear questions through earphones as well as read questions on the computer screen. Respondents move at their own speed and touch the screen to indicate their response. No proxy respondents or translators were used in situations when the respondents could not self-report. The questionnaire is located on the NHANES website at: https://wwwn.cdc.gov/nchs/data/nhanes/2017-2018/questionnaires/SXQ_ACASI_J.pdf.

Starting in 2017, two questions on sexual identity (one for male and one for female) for participants aged 18 to 59 years were moved to the interviewer administered portion of the MEC interview, using the Computer-Assisted Personal Interview (CAPI) system. The questionnaire is located on the NHANES website at: https://wwwn.cdc.gov/nchs/data/nhanes/2017-2018/questionnaires/SXQ_CAPI_J.pdf.

Quality Assurance & Quality Control

Both ACASI and CAPI systems are programmed with built-in consistency checks to reduce data entry errors. The systems also use online help screens to assist respondents and interviewers in defining key terms used in the questionnaire. All data was reviewed by the NHANES staff for accuracy and completeness. For details on the QA/QC process for this component, please refer to the MEC Interviewers Procedures Manual on the NHANES website.

Data Processing and Editing

The sexual behavior questionnaire in 2017-2018 is similar to cycles 2009-2016. However, analysts should be cautious when combining data with cycles prior to the NHANES 2009-2010 SXQ data, since some questions have been removed or added, and some questions have had slight wording changes. Please see the Analytic Notes below as well as Appendix 1 (for male) and Appendix 2 (for female) for detailed information on variables included in the SXQ section since the 2003-2004 cycle.

Participants aged 14 to 17 years were first asked question SXQ615 on whether they had ever had any kind of sex. The released variable SXD021 (Ever had vaginal, anal, or oral sex) was derived from SXQ615 and whether the respondent had reported having any of the specific types of sex. For example, if a male answered “yes” to SXQ615, but did not report an affirmative response to any of the following types of sex: SXQ800 (Ever had vaginal sex with a woman), SXQ803 (Ever performed oral sex on a woman), SXQ806 (Ever had anal sex with a woman), or SXQ809 (Ever had any sex with a man; anal, oral); the response was coded as a “2” or “no” in SXD021.

For participants aged 14 to 17 years, responses to age related questions in this section that were 9 years or less were grouped and coded as “9 years or younger.” This includes variables SXD031 (age first had any kind of sex), SXD633 (age first performed oral sex on woman), SXD621 (age first performed oral sex on man), and SXQ267 (age first told you had genital warts).

Information was collected using two-part (number and unit) questions for both SXD630 (last performed oral sex on a new male partner) and SXD642 (last performed oral sex on a new female partner). This is to allow participants to report how long ago they had performed oral sex either in days, weeks, months, or years. The released variables were edited to standardize the reported length of time to number of days (in integer), using the following conversion factors: 7 days per week, 30.4 days per month, and 365.25 days per year.

In general, if a respondent was not asked a question, the response to the question is shown as “missing.” It is up to the analysts to recode the response to zero as they see fit. For example, if a respondent reported that they had zero lifetime vaginal sex partners, they wouldn't be asked the number of vaginal sex partners in the past 12 months. Since the respondent does not receive the question about partners in the past 12 months, the data will be coded as missing for this variable. Analysts may want to recode this to “0” for their analyses.

For questions that ascertain total number of partners for all types of sex (i.e., SXD171, SXD510, SXD101 and SXD450), if the respondent had reported never having any type of sex, the responses were coded as “0.”

Analytic Notes

In the ACASI system, if participants did not answer the question and instead pressed “next” to move forward, they get a screen asking them to indicate: “I really meant to answer”, “I’d rather not answer”, or “I don’t know the answer.” If they chose “I really meant to answer”, they were taken back to the question so they could respond. If they selected “I’d rather not answer”, their response was coded as “refuse”. The selection of “I don’t know the answer” was coded as “don’t know.”

Although the ACASI has many advantages over interviewer-administered questionnaires for sensitive information, inconsistent responses can occur. Since the questions were self-administered, unlikely answers or confusing questions generally were not clarified by the interviewer. Although, the questionnaire was programmed to alert respondents of potential data entry errors or inconsistencies, not every possible consistency check was added. To minimize potential respondent frustration and confusion, the interview was not interrupted each time an inconsistent answer occurred in terms of the number of sexual partners for different periods of recall and/or for different types of sexual behavior.

Exam sample weights should be used for analyses. Please refer to the NHANES Analytic Guidelines and the on-line NHANES Tutorial for further details on the use of sample weights and other analytic issues.

Codebook and Frequencies

SEQN - Respondent sequence number

Variable Name:: SEQN
SAS Label:: Respondent sequence number
English Text:: Respondent sequence number.
Target:: Both males and females 14 YEARS - 17 YEARS

SXD021 - Ever had vaginal, anal, or oral sex (B)

Variable Name:: SXD021
SAS Label:: Ever had vaginal, anal, or oral sex (B)
English Text:: Ever had vaginal, anal, or oral sex.
English Instructions:: DERIVED FROM SXQ615, SXQ800, SXQ803, SXQ806, SXQ809 FOR MALES, AND SXQ615, SXQ700, SXQ703, SXQ706, SXQ709 FOR FEMALES.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	144	144
2	No	401	545
7	Refused	2	547
9	Don't know	0	547
.	Missing	30	577

SXD003B - CHECK ITEM

Variable Name:: SXD003B
English Instructions:: CHECK ITEM SXD003B: IF FEMALE AND SXD021=1, GO TO SXQ700. IF MALE AND SXD021=1, CONTINUE TO SXQ800. OTHERWISE, FEMALE GO TO SXD101 AND MALE GO TO SXD171.
Target:: Both males and females 14 YEARS - 17 YEARS

SXQ800 - Ever had vaginal sex with a woman (M)

Variable Name:: SXQ800
SAS Label:: Ever had vaginal sex with a woman (M)
English Text:: Have you ever had vaginal sex, also called sexual intercourse, with a woman? This means your penis in a woman's vagina.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	81	81
2	No	10	91
7	Refused	0	91
9	Don't know	0	91
.	Missing	486	577

SXQ803 - Ever performed oral sex on a woman (M)

Variable Name:: SXQ803
SAS Label:: Ever performed oral sex on a woman (M)
English Text:: Have you ever performed oral sex on a woman? This means putting your mouth on a woman's vagina or genitals.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	53	53
2	No	38	91
7	Refused	0	91
9	Don't know	0	91
.	Missing	486	577

SXQ806 - Ever had anal sex with a woman (M)

Variable Name:: SXQ806
SAS Label:: Ever had anal sex with a woman (M)
English Text:: Have you ever had anal sex with a woman? Anal sex means contact between your penis and a woman's anus or butt.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	13	13
2	No	78	91
7	Refused	0	91
9	Don't know	0	91
.	Missing	486	577

SXQ809 - Ever had any kind of sex w/man (M)

Variable Name:: SXQ809
SAS Label:: Ever had any kind of sex w/man (M)
English Text:: Have you ever had any kind of sex with a man, including oral or anal?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	5	5
2	No	86	91
7	Refused	0	91
9	Don't know	0	91
.	Missing	486	577

SXD862M - CHECK ITEM

Variable Name:: SXD862M
English Instructions:: BOX 1A CHECK ITEM SXD862M: IF (SXQ800, SXQ803, SXQ806, AND SXQ809) ALL EQUAL TO ('2' OR '.'), GO TO SXD171. OTHERWISE, GO TO SXD031.
Target:: Males only 14 YEARS - 17 YEARS

SXQ700 - Ever had vaginal sex with a man (F)

Variable Name:: SXQ700
SAS Label:: Ever had vaginal sex with a man (F)
English Text:: Have you ever had vaginal sex, also called sexual intercourse, with a man? This means a man's penis in your vagina.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	50	50
2	No	9	59
7	Refused	0	59
9	Don't know	0	59
.	Missing	518	577

SXQ703 - Ever performed oral sex on a man (F)

Variable Name:: SXQ703
SAS Label:: Ever performed oral sex on a man (F)
English Text:: Have you ever performed oral sex on a man? This means putting your mouth on a man's penis or genitals.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	41	41
2	No	18	59
7	Refused	0	59
9	Don't know	0	59
.	Missing	518	577

SXQ706 - Ever had anal sex with a man (F)

Variable Name:: SXQ706
SAS Label:: Ever had anal sex with a man (F)
English Text:: Have you ever had anal sex? This means contact between a man's penis and your anus or butt.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	9	9
2	No	50	59
7	Refused	0	59
9	Don't know	0	59
.	Missing	518	577

SXQ709 - Ever had any kind of sex w/woman (F)

Variable Name:: SXQ709
SAS Label:: Ever had any kind of sex w/woman (F)
English Text:: Have you ever had any kind of sex with a woman? By sex, we mean sexual contact with another woman's vagina or genitals.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	7	7
2	No	52	59
7	Refused	0	59
9	Don't know	0	59
.	Missing	518	577

SXD762F - CHECK ITEM

Variable Name:: SXD762F
English Instructions:: BOX 1A CHECK ITEM SXD762F: IF (SXQ700, SXQ703, SXQ706, AND SXQ709) ALL EQUAL TO ('2' OR '.'), GO TO SXD101. OTHERWISE, CONTINUE TO SXD031.
Target:: Females only 14 YEARS - 17 YEARS

SXD031 - Age first had any kind of sex (B)

Variable Name:: SXD031
SAS Label:: Age first had any kind of sex (B)
English Text:: How old were you when you had sex for the first time?
English Instructions:: AGE IN YEARS.
Target:: Both males and females 14 YEARS - 17 YEARS
Hard Edits:: 0 to 17

Code or Value	Value Description	Count	Cumulative
11 to 17	Range of Values	142	142
9	9 years or younger	2	144
77	Refused	0	144
99	Don't know	0	144
.	Missing	433	577

SXD701F - CHECK ITEM

Variable Name:: SXD701F
English Instructions:: BOX 1 CHECK ITEM SXD701F: IF SXQ741 = 1, GO TO SXD633. IF (SXQ741 NOT= 1 AND SXQ703 = 1), GO TO SXD621. OTHERWISE, GO TO SXD744F.
Target:: Females only 14 YEARS - 17 YEARS

SXD171 - # female sex partners/lifetime (M)

Variable Name:: SXD171
SAS Label:: # female sex partners/lifetime (M)
English Text:: In your lifetime, with how many women have you had any kind of sex?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 28	Range of Values	275	275
77777	Refused	0	275
99999	Don't know	0	275
.	Missing	302	577

SXD510 - # female sex partners/year (M)

Variable Name:: SXD510
SAS Label:: # female sex partners/year (M)
English Text:: In the past 12 months, with how many women have you had any kind of sex?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 19	Range of Values	275	275
77777	Refused	0	275
99999	Don't know	0	275
.	Missing	302	577

SXD821M - CHECK ITEM

Variable Name:: SXD821M
English Instructions:: BOX 3 CHECK ITEM SXD821M: IF (SXQ800, SXQ803, SXQ806, AND SXQ809) NOT EQUAL TO '1', GO TO END OF SECTION. IF SXQ800 = 1, CONTINUE TO SXQ824. OTHERWISE, GO TO SXD830M.
Target:: Males only 14 YEARS - 17 YEARS

SXQ824 - #female vaginal sex partners/lifetime(M)

Variable Name:: SXQ824
SAS Label:: #female vaginal sex partners/lifetime(M)
English Text:: In your lifetime, with how many women have you had vaginal sex? Vaginal sex means your penis in a woman's vagina.
English Instructions:: INSTRUCTIONS TO SP: Please enter a number.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 26	Range of Values	81	81
77777	Refused	0	81
99999	Don't know	0	81
.	Missing	496	577

SXQ827 - # female vaginal sex partners/year (M)

Variable Name:: SXQ827
SAS Label:: # female vaginal sex partners/year (M)
English Text:: In the past 12 months, with how many women have you had vaginal sex? Vaginal sex means your penis in a woman's vagina.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 7	Range of Values	81	81
77777	Refused	0	81
99999	Don't know	0	81
.	Missing	496	577

SXD830M - CHECK ITEM

Variable Name:: SXD830M
English Instructions:: BOX 4 CHECK ITEM SXD830M: IF SXQ803 = 1, CONTINUE TO SXD633. OTHERWISE, GO TO SXD833M.
Target:: Males only 14 YEARS - 17 YEARS

SXD633 - Age first performed oral sex on woman(B)

Variable Name:: SXD633
SAS Label:: Age first performed oral sex on woman(B)
English Text:: How old were you when you first performed oral sex on a woman? Performing oral sex means your mouth on a woman's vagina or genitals.
English Instructions:: AGE IN YEARS.
Target:: Both males and females 14 YEARS - 17 YEARS
Hard Edits:: 0 to 17

Code or Value	Value Description	Count	Cumulative
10 to 17	Range of Values	57	57
9	9 years or younger	1	58
77	Refused	0	58
99	Don't know	0	58
.	Missing	519	577

SXQ636 - # female oral sex partners/lifetime (B)

Variable Name:: SXQ636
SAS Label:: # female oral sex partners/lifetime (B)
English Text:: In your lifetime, on how many women have you performed oral sex?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 28	Range of Values	58	58
77777	Refused	0	58
99999	Don't know	0	58
.	Missing	519	577

SXQ639 - # female oral sex partners/year (B)

Variable Name:: SXQ639
SAS Label:: # female oral sex partners/year (B)
English Text:: In the past 12 months, on how many women have you performed oral sex?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 19	Range of Values	58	58
77777	Refused	0	58
99999	Don't know	0	58
.	Missing	519	577

SXD868M - CHECK ITEM

Variable Name:: SXD868M
English Instructions:: BOX 4B CHECK ITEM SXD868M: IF SP HAD ONLY 1 LIFETIME FEMALE ORAL SEX PARTNER (CODED '1') IN SXQ636, GO TO SXD833M. OTHERWISE CONTINUE TO SXD642.
Target:: Males only 14 YEARS - 17 YEARS

SXD768F - CHECK ITEM

Variable Name:: SXD768F
English Instructions:: BOX 6B CHECK ITEM SXD768F: IF SP HAD ONLY 1 LIFETIME FEMALE ORAL SEX PARTNER (CODED '1') IN SXQ636, AND SXQ703 = 1, THEN GO TO SXD621. IF SP HAD ONLY 1 LIFETIME FEMALE ORAL SEX PARTNER (SXQ636 = 1), AND SXQ703 NOT= 1, THEN GO TO SXD744F. OTHERWISE, CONTINUE TO SXD642.
Target:: Females only 14 YEARS - 17 YEARS

SXD642 - Last performed oral sex on new female(B)

Variable Name:: SXD642
SAS Label:: Last performed oral sex on new female(B)
English Text:: How long has it been since the last time you performed oral sex on a new female partner? A new sexual partner is someone that you had never had sex with before.
English Instructions:: NUMBER OF DAYS
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 730	Range of Values	28	28
77777	Refused	0	28
99999	Don't know	0	28
.	Missing	549	577

SXD833M - CHECK ITEM

Variable Name:: SXD833M
English Instructions:: BOX 5 CHECK ITEM SXD833M: IF SXQ809 = 1, CONTINUE TO SXQ410. OTHERWISE, GO TO SXD844M.
Target:: Males only 14 YEARS - 17 YEARS

SXD730F - CHECK ITEM

Variable Name:: SXD730F
English Instructions:: BOX 4 CHECK ITEM SXD730F: IF SXQ703 = 1, GO TO SXD621. OTHERWISE, GO TO SXD744F.
Target:: Females only 14 YEARS - 17 YEARS

SXQ410 - # male sex partners/lifetime(M)

Variable Name:: SXQ410
SAS Label:: # male sex partners/lifetime(M)
English Text:: In your lifetime, with how many men have you had anal or oral sex?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 7	Range of Values	5	5
77777	Refused	0	5
99999	Don't know	0	5
.	Missing	572	577

SXQ550 - # male sex partners/year (M)

Variable Name:: SXQ550
SAS Label:: # male sex partners/year (M)
English Text:: In the past 12 months, with how many men have you had anal or oral sex?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 3	Range of Values	5	5
77777	Refused	0	5
99999	Don't know	0	5
.	Missing	572	577

SXQ836 - # male anal sex partners/lifetime (M)

Variable Name:: SXQ836
SAS Label:: # male anal sex partners/lifetime (M)
English Text:: In your lifetime, with how many men have you had anal sex?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 7	Range of Values	5	5
77777	Refused	0	5
99999	Don't know	0	5
.	Missing	572	577

SXQ839M - CHECK ITEM

Variable Name:: SXQ839M
English Instructions:: BOX 6 CHECK ITEM SXQ839M: IF SP HAD NO ANAL SEX PARTNERS (CODED '0000' IN SXQ836), GO TO SXQ853. OTHERWISE, CONTINUE TO SXQ841.
Target:: Males only 14 YEARS - 17 YEARS

SXQ841 - # male anal sex partners/year (M)

Variable Name:: SXQ841
SAS Label:: # male anal sex partners/year (M)
English Text:: In the past 12 months, with how many men have you had anal sex?
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 3	Range of Values	5	5
77777	Refused	0	5
99999	Don't know	0	5
.	Missing	572	577

SXQ853 - Ever performed oral sex on a man (M)

Variable Name:: SXQ853
SAS Label:: Ever performed oral sex on a man (M)
English Text:: Have you ever performed oral sex on a man? Performing oral sex means your mouth on a man's penis or genitals.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	5	5
2	No	0	5
7	Refused	0	5
9	Don't know	0	5
.	Missing	572	577

SXD847M - CHECK ITEM

Variable Name:: SXD847M
English Instructions:: BOX 7 CHECK ITEM SXD847M: IF SP NEVER HAD ORAL MALE PARTNER (CODED '2', '7', OR '9') IN SXQ853, GO TO SXD844M. OTHERWISE, CONTINUE TO SXD621.
Target:: Males only 14 YEARS - 17 YEARS

SXD621 - Age first performed oral sex on man (B)

Variable Name:: SXD621
SAS Label:: Age first performed oral sex on man (B)
English Text:: How old were you when you first performed oral sex on a man? Performing oral sex means your mouth on a man's penis or genitals.
English Instructions:: AGE IN YEARS.
Target:: Both males and females 14 YEARS - 17 YEARS
Hard Edits:: 13 to 69

Code or Value	Value Description	Count	Cumulative
13 to 17	Range of Values	46	46
9	9 years or younger	0	46
77	Refused	0	46
99	Don't know	0	46
.	Missing	531	577

SXQ624 - # male oral sex partners/lifetime (B)

Variable Name:: SXQ624
SAS Label:: # male oral sex partners/lifetime (B)
English Text:: In your lifetime, on how many men have you performed oral sex?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 7	Range of Values	45	45
77777	Refused	1	46
99999	Don't know	0	46
.	Missing	531	577

SXQ627 - # male oral sex partners/year (B)

Variable Name:: SXQ627
SAS Label:: # male oral sex partners/year (B)
English Text:: In the past 12 months, on how many men have you performed oral sex?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 3	Range of Values	46	46
77777	Refused	0	46
99999	Don't know	0	46
.	Missing	531	577

SXD865M - CHECK ITEM

Variable Name:: SXD865M
English Instructions:: BOX 8B CHECK ITEM SXD865M: IF SP HAD ONLY 1 LIFETIME MALE ORAL SEX PARTNER (CODED '1') IN SXQ624, GO TO SXD844M. OTHERWISE, CONTINUE TO SXD630.
Target:: Males only 14 YEARS - 17 YEARS

SXD765F - CHECK ITEM

Variable Name:: SXD765F
English Instructions:: BOX 5 CHECK ITEM SXD765F: IF SP HAD ONLY 1 LIFETIME MALE ORAL SEX PARTNER (CODED '1') IN SXQ624, GO TO SXD744F. OTHERWISE, CONTINUE TO SXD630.
Target:: Females only 14 YEARS - 17 YEARS

SXD630 - Last perform oral sex on new male (B)

Variable Name:: SXD630
SAS Label:: Last perform oral sex on new male (B)
English Text:: How long has it been since the last time you performed oral sex on a new male partner? A new sexual partner is someone that you had never had sex with before.
English Instructions:: NUMBER OF DAYS
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 730	Range of Values	18	18
77777	Refused	0	18
99999	Don't know	0	18
.	Missing	559	577

SXD844M - CHECK ITEM

Variable Name:: SXD844M
English Instructions:: BOX 9A CHECK ITEM SXD844M: IF SP DID NOT HAVE A PARTNER IN PAST 12 MONTHS (SXD510, SXQ827, SXQ639, SXQ550, SXQ841, AND SXQ627 CODED '0000' OR MISSING OR '77777' OR '99999'), GO TO SXQ260. IF SP HAD ORAL SEX PARTNER IN PAST 12 MONTHS (SXQ627 OR SXQ639 GREATER THAN '0000' BUT LESS THAN '77777'), CONTINUE TO SXQ645. OTHERWISE, GO TO SXQ648.
Target:: Males only 14 YEARS - 17 YEARS

SXD744F - CHECK ITEM

Variable Name:: SXD744F
English Instructions:: BOX 7A CHECK ITEM SXD744F: IF SP DID NOT HAVE A PARTNER IN PAST 12 MONTHS (SXD450, SXQ727, SXQ627, SXQ639, AND SXQ490 CODED '0000' OR MISSING OR '77777' OR '99999'), GO TO SXD101. IF SP HAD ORAL SEX PARTNER IN PAST 12 MONTHS (SXQ627 OR SXQ639 GREATER THAN '0000' BUT LESS THAN '77777'), THEN CONTINUE TO SXQ645. OTHERWISE, GO TO SXQ648.
Target:: Females only 14 YEARS - 17 YEARS

SXQ645 - Use protection when perform oral sex (B)

Variable Name:: SXQ645
SAS Label:: Use protection when perform oral sex (B)
English Text:: When you performed oral sex in the past 12 months, how often would you use protection, like a condom or dental dam?
English Instructions:: THE ITEM INCLUDES SEX WITH BOTH MALE AND FEMALE PARTNERS.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Never	48	48
2	Rarely	8	56
3	Usually	6	62
4	Always	19	81
5	Unsure	0	81
7	Refused	0	81
9	Don't know	0	81
.	Missing	496	577

SXQ648 - Had sex with a new partner past 12mos(B)

Variable Name:: SXQ648
SAS Label:: Had sex with a new partner past 12mos(B)
English Text:: In the past 12 months, did you have any kind of sex with a person that you never had sex with before?
English Instructions:: THE ITEM INCLUDES SEX WITH BOTH MALE AND FEMALE PARTNERS.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	74	74
2	No	50	124
7	Refused	0	124
9	Don't know	0	124
.	Missing	453	577

SXD859M - CHECK ITEM

Variable Name:: SXD859M
English Instructions:: BOX 10A CHECK ITEM SXD859M: IF (SXQ800, SXQ806, AND SXQ809) NOT EQUAL TO '1', GO TO SXQ590. OTHERWISE, CONTINUE TO SXQ610.
Target:: Males only 14 YEARS - 17 YEARS

SXD759F - CHECK ITEM

Variable Name:: SXD759F
English Instructions:: BOX 8A CHECK ITEM SXD759F: IF (SXQ700 OR SXQ706) = 1, CONTINUE TO SXQ610. OTHERWISE, GO TO SXQ590.
Target:: Females only 14 YEARS - 17 YEARS

SXQ610 - Had vaginal/anal sex in past 12 mos (B)

Variable Name:: SXQ610
SAS Label:: Had vaginal/anal sex in past 12 mos (B)
English Text:: In the past 12 months, about how many times have you had {vaginal or anal/vaginal/anal} sex?
English Instructions:: THE ITEM INCLUDES SEX WITH BOTH MALE AND FEMALE PARTNERS.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0	Never	4	4
1	Once	23	27
2	2-11 times	50	77
3	12-51 times	23	100
4	52-103 times	7	107
5	104-364 times	7	114
6	365 times or more	1	115
77	Refused	1	116
99	Don't know	0	116
.	Missing	461	577

SXD245M - CHECK ITEM

Variable Name:: SXD245M
English Instructions:: BOX 10 CHECK ITEM SXD245M: IF SP DID NOT HAVE VAGINAL OR ANAL SEX (CODED '0') IN SXQ610, GO TO SXQ590. OTHERWISE, CONTINUE TO SXQ251.
Target:: Males only 14 YEARS - 17 YEARS

SXD246F - CHECK ITEM

Variable Name:: SXD246F
English Instructions:: BOX 8 CHECK ITEM SXD246F: IF SP DID NOT HAVE VAGINAL OR ANAL SEX (CODED '0') IN SXQ610, GO TO SXQ590. OTHERWISE, CONTINUE TO SXQ251.
Target:: Females only 14 YEARS - 17 YEARS

SXQ251 - Had vaginal/anal sex without condom (B)

Variable Name:: SXQ251
SAS Label:: Had vaginal/anal sex without condom (B)
English Text:: In the past 12 months, about how often have you had {vaginal or anal/vaginal/anal} sex without using a condom?
English Instructions:: THE ITEM INCLUDES SEX WITH BOTH MALE AND FEMALE PARTNERS.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Never	45	45
2	Less than half of the time	21	66
3	About half of the time	13	79
4	Not always, but more than half of the time	9	88
5	Always	23	111
7	Refused	0	111
9	Don't know	1	112
.	Missing	465	577

SXQ590 - # sex partners 5 years older/year (B)

Variable Name:: SXQ590
SAS Label:: # sex partners 5 years older/year (B)
English Text:: Of the persons you had any kind of sex with in the past 12 months, how many were five or more years older than you?
English Instructions:: THE ITEM INCLUDES SEX WITH BOTH MALE AND FEMALE PARTNERS.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 3	Range of Values	124	124
77777	Refused	0	124
99999	Don't know	0	124
.	Missing	453	577

SXQ600 - # sex partners 5 years younger/year (B)

Variable Name:: SXQ600
SAS Label:: # sex partners 5 years younger/year (B)
English Text:: Of the persons you had any kind of sex with in the past 12 months, how many were five or more years younger than you?
English Instructions:: THE ITEM INCLUDES SEX WITH BOTH MALE AND FEMALE PARTNERS.
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 2	Range of Values	124	124
77777	Refused	0	124
99999	Don't know	0	124
.	Missing	453	577

SXD004B - CHECK ITEM

Variable Name:: SXD004B
English Instructions:: CHECK ITEM SXD004B: IF MALE, GO TO SXQ260. IF FEMALE, CONTINUE TO SXD101.
Target:: Both males and females 14 YEARS - 17 YEARS

SXD101 - # male sex partners/lifetime (F)

Variable Name:: SXD101
SAS Label:: # male sex partners/lifetime (F)
English Text:: In your lifetime, with how many men have you had any kind of sex?
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 6	Range of Values	272	272
77777	Refused	0	272
99999	Don't know	0	272
.	Missing	305	577

SXD450 - # male sex partners/year (F)

Variable Name:: SXD450
SAS Label:: # male sex partners/year (F)
English Text:: In the past 12 months, with how many men have you had any kind of sex?
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 6	Range of Values	272	272
77777	Refused	0	272
99999	Don't know	0	272
.	Missing	305	577

SXD721F - CHECK ITEM

Variable Name:: SXD721F
English Instructions:: BOX 3 CHECK ITEM SXD721F: IF (SXQ700, SXQ703, SXQ706, AND SXQ709) NOT EQUAL TO '1', GO TO END OF SECTION. IF SXQ700 = 1, CONTINUE TO SXQ724. OTHERWISE, GO TO SXD733F.
Target:: Females only 14 YEARS - 17 YEARS

SXQ724 - # male vaginal sex partners/lifetime (F)

Variable Name:: SXQ724
SAS Label:: # male vaginal sex partners/lifetime (F)
English Text:: In your lifetime, with how many men have you had vaginal sex? Vaginal sex means a man's penis in your vagina.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 6	Range of Values	50	50
77777	Refused	0	50
99999	Don't know	0	50
.	Missing	527	577

SXQ727 - # male vaginal sex partners/year (F)

Variable Name:: SXQ727
SAS Label:: # male vaginal sex partners/year (F)
English Text:: In the past 12 months, with how many men have you had vaginal sex? Vaginal sex means a man's penis in your vagina.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 6	Range of Values	50	50
77777	Refused	0	50
99999	Don't know	0	50
.	Missing	527	577

SXD733F - CHECK ITEM

Variable Name:: SXD733F
English Instructions:: BOX 6 CHECK ITEM SXD733F: IF SXQ709 = 1, CONTINUE TO SXQ130. OTHERWISE, GO TO SXQ753.
Target:: Females only 14 YEARS - 17 YEARS

SXQ130 - # female sex partners/lifetime (F)

Variable Name:: SXQ130
SAS Label:: # female sex partners/lifetime (F)
English Text:: In your lifetime with how many women have you had sex? By sex, we mean sexual contact with another woman's vagina or genitals.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1 to 8	Range of Values	7	7
77777	Refused	0	7
99999	Don't know	0	7
.	Missing	570	577

SXQ490 - # female sex partners/year (F)

Variable Name:: SXQ490
SAS Label:: # female sex partners/year (F)
English Text:: In the past 12 months, with how many women have you had sex? By sex, we mean sexual contact with another woman's vagina or genitals.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
0 to 1	Range of Values	7	7
77777	Refused	0	7
99999	Don't know	0	7
.	Missing	570	577

SXQ741 - Ever performed oral sex on a woman (F)

Variable Name:: SXQ741
SAS Label:: Ever performed oral sex on a woman (F)
English Text:: Have you ever performed oral sex on a woman? Performing oral sex means your mouth on a woman's vagina or genitals.
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	5	5
2	No	2	7
7	Refused	0	7
9	Don't know	0	7
.	Missing	570	577

SXQ753 - Ever told that you had HPV (F)

Variable Name:: SXQ753
SAS Label:: Ever told that you had HPV (F)
English Text:: Has a doctor or other health care professional ever told you that you had human papillomavirus or HPV?
Target:: Females only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	0	0
2	No	57	57
7	Refused	0	57
9	Don't know	0	57
.	Missing	520	577

SXQ260 - Ever told that you had genital herpes(B)

Variable Name:: SXQ260
SAS Label:: Ever told that you had genital herpes(B)
English Text:: Has a doctor or other health care professional ever told you that you had genital herpes?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	0	0
2	No	144	144
7	Refused	0	144
9	Don't know	0	144
.	Missing	433	577

SXQ265 - Ever told that you had genital warts (B)

Variable Name:: SXQ265
SAS Label:: Ever told that you had genital warts (B)
English Text:: Has a doctor or other health care professional ever told you that you had genital warts?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative	Skip to Item
1	Yes	0	0
2	No	144	144	SXQ270
7	Refused	0	144	SXQ270
9	Don't know	0	144	SXQ270
.	Missing	433	577

SXQ267 - Age first told you had genital warts (B)

Variable Name:: SXQ267
SAS Label:: Age first told you had genital warts (B)
English Text:: How old were you when you were first told that you had genital warts?
English Instructions:: AGE IN YEARS.
Target:: Both males and females 14 YEARS - 17 YEARS
Hard Edits:: 0 to 17

Code or Value	Value Description	Count	Cumulative
9	9 years or younger	0	0
77	Refused	0	0
99	Don't know	0	0
.	Missing	577	577

SXQ270 - Ever told that you had gonorrhea (B)

Variable Name:: SXQ270
SAS Label:: Ever told that you had gonorrhea (B)
English Text:: In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	0	0
2	No	144	144
7	Refused	0	144
9	Don't know	0	144
.	Missing	433	577

SXQ272 - Ever told that you had chlamydia (B)

Variable Name:: SXQ272
SAS Label:: Ever told that you had chlamydia (B)
English Text:: In the past 12 months, has a doctor or other health care professional told you that you had chlamydia?
Target:: Both males and females 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Yes	3	3
2	No	141	144
7	Refused	0	144
9	Don't know	0	144
.	Missing	433	577

SXD005B - CHECK ITEM

Variable Name:: SXD005B
English Instructions:: CHECK ITEM SXD005B: IF FEMALE, GO TO END OF SECTION. IF MALE, CONTINUE TO SXQ280.
Target:: Both males and females 14 YEARS - 17 YEARS

SXQ280 - Circumcised or uncircumcised? (M)

Variable Name:: SXQ280
SAS Label:: Circumcised or uncircumcised? (M)
English Text:: Are you circumcised or uncircumcised?
English Instructions:: CAPI INSTRUCTIONS: Display the sketches below each selection. Sketch should display by default. ACASI FIGURE SXQ1 - CLINICAL SKETCH OF CIRCUMCISED PENIS. ACASI FIGURE SXQ2 - CLINICAL SKETCH OF UNCIRCUMCISED PENIS.
Target:: Males only 14 YEARS - 17 YEARS

Code or Value	Value Description	Count	Cumulative
1	Circumcised	208	208
2	Uncircumcised	62	270
7	Refused	1	271
9	Don't know	0	271
.	Missing	306	577

Appendix 1. Sexual Behavior (SXQ) Data for Males in NHANES 2003-2018 Release Files


	2003-2004 Variable name/Question	2005-2006 Variable name/Question	2007-2008† Variable name/Question	2009-2018 Variable name/Question
Target age	14-59 years	14-59 years	14-69 years	14-69 years
Ever had any type of sex	SXQ020 The next set of questions is about your sexual behavior. By sex, we mean vaginal, oral, or anal sex. Please remember that your answers are strictly confidential. Have you ever had sex?	SXQ021 The next set of questions is about your sexual behavior. By sex, we mean vaginal, anal, or oral sex. Please remember that your answers are strictly confidential. Have you ever had vaginal, anal, or oral sex?	SXQ021 The next set of questions is about your sexual behavior. By sex, we mean vaginal, anal, or oral sex. Please remember that your answers are strictly confidential. Have you ever had vaginal, anal, or oral sex?	SXD021 Ever had vaginal, anal, or oral sex. Derived from: SXQ800 SXQ803 SXQ806 SXQ809 SXQ615¥
	Not included	Not included	Not included	SXQ800 Have you ever had vaginal sex, also called sexual intercourse, with a woman? This means your penis in a woman’s vagina.
	Not included	Not included	Not included	SXQ803 Have you ever performed oral sex on a woman? This means putting your mouth on a woman’s vagina or genitals.
	Not included	Not included	Not included	SXQ806 Have you ever had anal sex with a woman? Anal sex means contact between your penis and a woman’s anus or butt.
	Not included	Not included	Not included	SXQ809 Have you ever had any kind of sex with a man, including oral or anal?
Age of having sex for the first time	SXD030 How old were you when you had sex for the first time?	SXD031 When you first had vaginal, anal, or oral sex, how old were you?	SXD031 When you first had vaginal, anal, or oral sex, how old were you?	SXD031€ How old were you the first time you had any kind of sex, including {vaginal, anal, or oral/vaginal or anal/vaginal or oral/anal or oral/vaginal/anal/oral}?
Life time female sex partner(s)	SXQ170 In your lifetime, with how many women have you had sex?	SXD171 In your lifetime, with how many females have you had vaginal, anal, or oral sex?	SXD171 In your lifetime, with how many females have you had vaginal, anal, or oral sex?	SXD171 In your lifetime, with how many women have you had any kind of sex?
	Not included	SXQ400 With how many of these females have you had only oral sex?	SXQ400* With how many of these females have you had only oral sex?	Not included
	Not included	Not included	Not included	SXQ824* In your lifetime, with how many women have you had vaginal sex? Vaginal sex means your penis in a woman’s vagina.
	Not included	Not included	Not included	SXQ636* In your lifetime, on how many women have you performed oral sex?
Female sex partner(s) in the last 12 months	SXQ190 In the past 12 months, with how many women have you had sex?	SXQ510 In the past 12 months, with how many females have you had vaginal, anal, or oral sex?	SXQ510* In the past 12 months, with how many females have you had vaginal, anal, or oral sex?	SXD510* In the past 12 months, with how many women have you had any kind of sex?
	Not included	SXQ530 With how many of these females have you had only oral sex?	SXQ530* With how many of these females have you had only oral sex?	Not included
	Not included	Not included	Not included	SXQ827* In the past 12 months, with how many women have you had vaginal sex? Vaginal sex means your penis in a woman’s vagina.
	Not included	Not included	Not included	SXQ639* In the past 12 months, on how many women have you performed oral sex?
Oral sex with female partner	Not included	Not included	Not included	SXD633* How old were you when you first performed oral sex on a woman? Performing oral sex means your mouth on a woman’s vagina or genitals.
Oral sex with female partner	Not included	Not included	Not included	SXD642* How long has it been since the last time you performed oral sex on a new female partner? A new sexual partner is someone that you had never had sex with before.
Life time male sex partner(s)	SXQ200 In your lifetime, with how many men have you had sex?	SXQ410 In your lifetime, with how many males have you had anal or oral sex?	SXQ410 In your lifetime, with how many males have you had anal or oral sex?	SXQ410 In your lifetime, with how many men have you had anal or oral sex?
	Not included	SXQ430 With how many of these males have you had only oral sex?	SXQ430 With how many of these males have you had only oral sex?	Not included
	Not included	Not included	Not included	SXQ836 In your lifetime, with how many men have you had anal sex?
	Not included	Not included	Not included	SXQ624 In your lifetime, on how many men have you performed oral sex?
Male sex partner(s) in the last 12 months	SXQ220 In the past 12 months, with how many men have you had sex?	SXQ550 In the past 12 months, with how many males have you had anal or oral sex?	SXQ550* In the past 12 months, with how many males have you had anal or oral sex?	SXQ550* In the past 12 months, with how many men have you had anal or oral sex?
	Not included	SXQ570 With how many of these males have you had only oral sex?	SXQ570* With how many of these males have you had only oral sex?	Not included
	Not included	Not included	Not included	SXQ841* In the past 12 months, with how many men have you had anal sex?
	Not included	Not included	Not included	SXQ627* In the past 12 months, on how many men have you performed oral sex?
Oral sex with male partner	Not included	Not included	Not included	SXQ853 Have you ever performed oral sex on a man? Performing oral sex means your mouth on a man’s penis or genitals.
	Not included	Not included	Not included	SXD621 How old were you when you first performed oral sex on a man? Performing oral sex means your mouth on a man’s penis or genitals.
	Not included	Not included	Not included	SXD630* How long has it been since the last time you performed oral sex on a new male partner? A new sexual partner is someone that you had never had sex with before.
Sex in the past 12 months	SXQ241 In the past 30 days, with how many people have you had sex?	SXQ610 In the past 12 months, about how many times have you had vaginal or anal sex?	SXQ610* In the past 12 months, about how many times have you had vaginal or anal sex?	SXQ610€* In the past 12 months, about how many times have you had {vaginal or anal/vaginal/anal} sex?
	Not included	SXQ590 Of the persons you had sex with in the past 12 months, how many were five or more years older than you?	SXQ590* Of the persons you had sex with in the past 12 months, how many were five or more years older than you?	SXQ590£ Of the persons you had any kind of sex with in the past 12 months, how many were five or more years older than you?
	Not included	SXQ600 Of the persons you had sex with in the past 12 months, how many were five or more years younger than you?	SXQ600* Of the persons you had sex with in the past 12 months, how many were five or more years younger than you?	SXQ600£ Of the persons you had any kind of sex with in the past 12 months, how many were five or more years younger than you?
	Not included	Not included	Not included	SXQ648* In the past 12 months, did you have any kind of sex with a person that you never had sex with before?
	SXQ250 In the past 30 days, how many times have you had sex without using a condom?	SXQ251 In the past 12 months, about how often have you had vaginal or anal sex without using a condom?	SXQ251* In the past 12 months, about how often have you had vaginal or anal sex without using a condom?	SXQ251€* In the past 12 months, about how often have you had {vaginal or anal/vaginal/anal} sex without using a condom?
	Not included	Not included	Not included	SXQ645* When you performed oral sex in the past 12 months, how often would you use protection, like a condom or dental dam?
History of sexually transmitted diseases	SXQ260 Has a doctor or other health professional ever told you that you had genital herpes?	SXQ260 Has a doctor or other health professional ever told you that you had genital herpes?	SXQ260* Has a doctor or other health professional ever told you that you had genital herpes?	SXQ260* Has a doctor or other health professional ever told you that you had genital herpes?
	SXQ265 Has a doctor or health care professional ever told you that you had genital warts?	SXQ265 Has a doctor or health care professional ever told you that you had genital warts?	SXQ265* Has a doctor or health care professional ever told you that you had genital warts?	SXQ265* Has a doctor or health care professional ever told you that you had genital warts?
	Not included	Not included	Not included	*SXQ267‡** How old were you when you were first told that you had genital warts?
	SXQ270 In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?	SXQ270 In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?	SXQ270* In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?	SXQ270* In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?
	SXQ272 In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?	SXQ272 In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?	SXQ272* In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?	SXQ272* In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?
Circumcision status	SXQ280 Are you circumcised or uncircumcised?	SXQ280 Are you circumcised or uncircumcised?	SXQ280* Are you circumcised or uncircumcised?	*SXQ280₮** Are you circumcised or uncircumcised?
Sexual identity/ attraction	SXQ292# Do you think of yourself as…	SXQ292# Do you think of yourself as…	SXQ292# Do you think of yourself as…	SXQ292# Do you think of yourself as... SXQ296#± Which of the following best represents how you think of yourself?
Interview status	Not included	SXAISC Interview status code	SXAISC Interview status code	Not included


†	Questions were changed during data collection: “vaginal, anal, and oral” qualifiers were removed. See documentation accompanied 2007-2008 data file (available at: https://wwwn.cdc.gov/nchs/nhanes/2007-2008/SXQ_E.htm) for more details.
¥	Target age: 14-17 years.
*	Target age: 14-59 years.
£	Target age changed from 14-59 years to 14-29 years in 2009-2010.
€	Question was edited to include "fills". For example, depending on what types of sex respondents indicated having determines the fills in the question.
#	Target age: 18-59 years.
‡	Question was added in 2013-2014.
₮	In 2013-2018, the circumcision question was not asked to men who answered “No” (code=2) to all of the type-specific sex questions (i.e., SXQ800, SXQ803, SXQ806, and SXQ809). However, the question was asked to youth 14-17 years who answered “No” to SXQ615 during the same data collection cycles.
±	Wording and response categories for question modified in 2015-2016. Moved to interviewer-administered MEC CAPI interview in 2017-2018.

Appendix 2. Sexual Behavior (SXQ) Data for Females in NHANES 2003-2018 Release Files


	2003-2004 Variable name/Question	2005-2006 Variable name/Question	2007-2008† Variable name/Question	2009-2018 Variable name/Question
Target age	14-59 years	14-59 years	14-69 years	14-69 years
Ever had any type of sex	SXQ020 The next set of questions is about your sexual behavior. By sex, we mean vaginal, oral, or anal sex. Please remember that your answers are strictly confidential. Have you ever had sex?	SXQ021 The next set of questions is about your sexual behavior. By sex, we mean vaginal, anal, or oral sex. Please remember that your answers are strictly confidential. Have you ever had vaginal, anal, or oral sex?	SXQ021 The next set of questions is about your sexual behavior. By sex, we mean vaginal, anal, or oral sex. Please remember that your answers are strictly confidential. Have you ever had vaginal, anal, or oral sex?	SXD021 Ever had vaginal, anal, or oral sex. Derived from: SXQ700 SXQ703 SXQ706 SXQ709 SXQ615¥
	Not included	Not included	Not included	SXQ700 Have you ever had vaginal sex, also called sexual intercourse, with a man? This means a man’s penis in your vagina.
	Not included	Not included	Not included	SXQ703 Have you ever performed oral sex on a man? This means putting your mouth on a man’s penis or genitals.
	Not included	Not included	Not included	SXQ706 Have you ever had anal sex? This means contact between a man’s penis and your anus or butt.
	Not included	Not included	Not included	SXQ709 Have you ever had any kind of sex with a woman? By sex, we mean sexual contact with another woman’s vagina or genitals.
Age of having sex for the first time	SXD030 How old were you when you had sex for the first time?	SXD031 When you first had vaginal, anal, or oral sex, how old were you?	SXD031 When you first had vaginal, anal, or oral sex, how old were you?	SXD031€ How old were you the first time you had any kind of sex, including {vaginal, anal, or oral/vaginal or anal/vaginal or oral/anal or oral/vaginal/anal/oral}?
Life time male sex partner(s)	SXQ100 In your lifetime, with how many men have you had sex?	SXQ101 In your lifetime, with how many males have you had vaginal, anal, or oral sex?	SXQ101 In your lifetime, with how many males have you had vaginal, anal, or oral sex?	SXD101 In your lifetime, with how many men have you had any kind of sex?
	Not included	SXQ350 With how many of these males have you had only oral sex?	SXQ350* With how many of these males have you had only oral sex?	Not included
	Not included	Not included	Not included	SXQ724* In your lifetime, with how many men have you had vaginal sex? Vaginal sex means a man’s penis in your vagina.
	Not included	Not included	Not included	SXQ624* In your lifetime, on how many men have you performed oral sex?
Male sex partner(s) in the last 12 months	SXQ120 In the past 12 months, with how many men have you had sex?	SXQ450 In the past 12 months, with how many males have you had vaginal, anal, or oral sex?	SXQ450* In the past 12 months, with how many males have you had vaginal, anal, or oral sex?	SXD450* In the past 12 months, with how many men have you had any kind of sex?
	Not included	SXQ470 With how many of these males have you had only oral sex?	SXQ470* With how many of these males have you had only oral sex?	Not included
	Not included	Not included	Not included	SXQ727* In the past 12 months, with how many men have you had vaginal sex? Vaginal sex means a man’s penis in your vagina.
	Not included	Not included	Not included	SXQ627* In the past 12 months, on how many men have you performed oral sex?
Oral sex with male partner	Not included	Not included	Not included	SXD621* How old were you when you first performed oral sex on a man? Performing oral sex means your mouth on a man’s penis or genitals.
Oral sex with male partner	Not included	Not included	Not included	SXD630* How long has it been since the last time you performed oral sex on a new male partner? A new sexual partner is someone that you had never had sex with before.
Life time female sex partner(s)	SXQ130 In your lifetime, with how many women have you had sex?	SXQ130 In your lifetime, with how many women have you had sex?	In your lifetime, with how many women have you had sex?	SXQ130* In your lifetime with how many women have you had sex? By sex, we mean sexual contact with another woman’s vagina or genitals.
Life time female sex partner(s)	Not included	Not included	Not included	SXQ636* In your lifetime, on how many women have you performed oral sex?
Female sex partner(s) in the last 12 months	SXQ150 In the past 12 months, with how many women have you had sex?	SXQ490 In the past 12 months, with how many females have you had sex?	SXQ490* In the past 12 months, with how many females have you had sex?	SXQ490* In the past 12 months, with how many women have you had sex? By sex, we mean sexual contact with another woman’s vagina or genitals.
Female sex partner(s) in the last 12 months	Not included	Not included	Not included	SXQ639* In the past 12 months, on how many women have you performed oral sex?
Oral sex with female partner	Not included	Not included	Not included	SXQ741* Have you ever performed oral sex on a woman? Performing oral sex means your mouth on a woman’s vagina or genitals.
	Not included	Not included	Not included	SXD633* How old were you when you first performed oral sex on a woman? Performing oral sex means your mouth on a woman’s vagina or genitals.
	Not included	Not included	Not included	SXD642* How long has it been since the last time you performed oral sex on a new female partner? A new sexual partner is someone that you had never had sex with before.
Sex in the past 12 months	SXQ241 In the past 30 days, with how many people have you had sex?	SXQ610 In the past 12 months, about how many times have you had vaginal or anal sex?	SXQ610* In the past 12 months, about how many times have you had vaginal or anal sex?	SXQ610€* In the past 12 months, about how many times have you had {vaginal or anal/vaginal/anal} sex?
	Not included	SXQ590 Of the persons you had sex with in the past 12 months, how many were five or more years older than you?	SXQ590* Of the persons you had sex with in the past 12 months, how many were five or more years older than you?	SXQ590£ Of the persons you had any kind of sex with in the past 12 months, how many were five or more years older than you?
	Not included	SXQ600 Of the persons you had sex with in the past 12 months, how many were five or more years younger than you?	SXQ600* Of the persons you had sex with in the past 12 months, how many were five or more years younger than you?	SXQ600£ Of the persons you had any kind of sex with in the past 12 months, how many were five or more years younger than you?
	Not included	Not included	Not included	SXQ648* In the past 12 months, did you have any kind of sex with a person that you never had sex with before?
	SXQ250 In the past 30 days, how many times have you had sex without using a condom?	SXQ251 In the past 12 months, about how often have you had vaginal or anal sex without using a condom?	SXQ251* In the past 12 months, about how often have you had vaginal or anal sex without using a condom?	SXQ251€* In the past 12 months, about how often have you had {vaginal or anal/vaginal/anal} sex without using a condom?
	Not included	Not included	Not included	SXQ645* When you performed oral sex in the past 12 months, how often would you use protection, like a condom or dental dam?
History of sexually transmitted diseases	SXQ260 Has a doctor or other health professional ever told you that you had genital herpes?	SXQ260 Has a doctor or other health professional ever told you that you had genital herpes?	SXQ260* Has a doctor or other health professional ever told you that you had genital herpes?	SXQ260* Has a doctor or other health professional ever told you that you had genital herpes?
	SXQ265 Has a doctor or health care professional ever told you that you had genital warts?	SXQ265 Has a doctor or health care professional ever told you that you had genital warts?	SXQ265* Has a doctor or health care professional ever told you that you had genital warts?	SXQ265* Has a doctor or health care professional ever told you that you had genital warts?
	Not included	Not included	Not included	*SXQ267‡** How old were you when you were first told that you had genital warts?
	Not included	Not included	Not included	SXQ753* Has a doctor or other health care professional ever told you that you had human papillomavirus or HPV?
	SXQ270 In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?	SXQ270 In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?	SXQ270* In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?	SXQ270* In the past 12 months, has a doctor or other health care professional told you that you had gonorrhea, sometimes called GC or clap?
	SXQ272 In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?	SXQ272 In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?	SXQ272* In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?	SXQ272* In the past 12 months, has a doctor or other health care professional told you that you had Chlamydia?
Sexual identity/ attraction	SXQ294# Do you think of yourself as…	SXQ294# Do you think of yourself as…	SXQ294# Do you think of yourself as…	SXQ294# Do you think of yourself as... SXQ295#± Which of the following best represents how you think of yourself?
Interview status	Not included	SXAISC Interview status code	SXAISC Interview status code	Not included


†	Questions were changed during data collection: “vaginal, anal, and oral” qualifiers were removed. See documentation accompanied 2007-2008 data file (available at: https://wwwn.cdc.gov/nchs/nhanes/2007-2008/SXQ_E.htm) for more details.
¥	Target age: 14-17 years.
*	Target age: 14-59 years.
£	Target age changed from 14-59 years to 14-29 years in 2009-2010.
€	Question was edited to include "fills". For example, depending on what types of sex respondents indicated having determines the fills in the question.
#	Target age: 18-59 years.
‡	Question was added in 2013-2014.
±	Wording and response categories for question modified in 2015-2016. Moved to interviewer-administered MEC CAPI interview in 2017-2018.

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