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Additional longitudinal research on young adults using biomarkers for STIs is needed in order to confirm that the influence of timing of first intercourse fades over time and is eclipsed by other factors as participants age. Younger ages at first intercourse were associated with higher odds of STI in comparison with older ages, but the effect diminished with increasing current age. Self-reports may also have introduced bias into previous studies, since diagnosis may depend on access to regular health services. All estimates were standardized to US Census data on the demographic characteristics of the adolescent population, as recommended by the Add Health research team The authors examined the relation between age at first vaginal intercourse and a positive nucleic acid amplification test for sexually transmitted infection STI. Nevertheless, computer-assisted self-interviewing cannot mitigate the possible influence of recall bias. This allowed us to explore how early first intercourse was associated with the prevalence of infection among specific age groups. The social organization of sexuality: sexual practices in the United States.

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