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FIGURE 1—

FIGURE 1—. From: Sexual Timetables for Oral-Genital, Vaginal, and Anal Intercourse: Sociodemographic Comparisons in a Nationally Representative Sample of Adolescents.

Venn diagram illustrating the overlap among initiation of vaginal, oral-genital, and anal intercourse, by biological sex, by age 18 years among male and female adolescents: National Longitudinal Study of Adolescent Health, 2008.
Denominator is all male and all female adolescents. Percentages do not sum to 100 because respondents with no sexual experience by age 18 years are not shown. Dash indicates that cell size is too small to be displayed.
a1300 male adolescents reported no sexual experiences by age 18.
b1466 female adolescents reported no sexual experiences by age 18.

Carolyn Tucker Halpern, et al. Am J Public Health. 2012 June;102(6):1221-1228.

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