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The authors examined the relation between age at first vaginal intercourse and a positive nucleic acid amplification test for sexually transmitted infection (STI).A nationally representative sample of 9,844 respondents aged 18–26 years was tested for chlamydial infection, gonorrhea, and trichomoniasis in wave 3 (2001–2002) of the National Longitudinal Study of Adolescent Health.Early sexual intercourse may be more normative in some socioeconomic, racial, ethnic, or sex groups and thus may not be tied to nonnormative risk behaviors or to longitudinal risk of STI (27–29).Therefore, the long-term impact of programs aimed at prolonging virginity may vary among groups of young adults and may mitigate or exacerbate current disparities.Young adults aged 18–24 years report much higher annual rates of STI than older adults and carry a heavy disease burden (15, 21).If delaying sexual intercourse in adolescence carries a lasting benefit of reduced STIs in young adulthood, this would represent a potentially huge impact for such a strategy in terms of long-term health benefits in the population.These sexual “scripts” serve as guidelines for what types of sexual behaviors and partners are appropriate at different ages, and they could vary based on an adolescent's sex, race, or ethnicity (13–15).Nonnormative sexual scripts and early first sexual intercourse (an off-time event) may represent a life-course transition that increases the likelihood of a longitudinal pattern of risky sexual activity.

With regard to sexual behavior, adolescents develop elaborate sets of ideas concerning sexuality and their sexual roles well before they actually engage in sexual activity (13).

and 2) does the effect of early sexual intercourse on later STI vary by the respondent's sex, race, ethnicity, parental education, or current age?

We used data from adolescents and young adults who had reported engaging in sexual intercourse and had been tested for in wave 3 of the National Longitudinal Study of Adolescent Health (Add Health) (30).

In this study, our goal was to clarify the long-term sexual health consequences of the timing of first sexual intercourse and to elucidate how such consequences might vary by characteristics of the individual.

We examined the following research questions: 1) is early sexual intercourse associated with increased likelihood of testing positive for an STI among older adolescents and young adults?

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