Overall, approximately 3% of Add Health participants reported no sexual experience by the time of the Wave IV interview. In Fig. 1, we present the percentages of sexually inexperienced participants by age and gender among those who were inexperienced at age 18. Initiation of sexual activity was concentrated at younger ages. While well over 50% of previously inexperienced men and women went on to initiate sexual activity between ages 19 to 21, less than 5% did so between ages 27 to 30 combined. Fifteen percent of males and 13% of females who had had no sexual experience (among oral-genital, vaginal, and anal sex) by age 18 remained sexually inexperienced by the Wave IV interview.

* 조사대상

We used data from the National Longitudinal Study of Adolescent Health (Add Health), a prospective cohort study of approximately 20,000 participants in Grades 7–12 in the 1994– 1995 school-year. To date, four waves of data collection have followed Add Health participants from adolescence into adulthood.