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1 usbands of cases with early than late age at first intercourse.
4 small minority of teenagers have unprotected first intercourse, and early motherhood is more strongly
5 en reported fewer sexual partnerships, later first intercourse, and substantially lower prevalence of
6 dds of having an STI among 24-year-olds with first intercourse at age 13 versus those with first inte
7 irst intercourse at age 13 versus those with first intercourse at age 17 were the same (prevalence od
9 5% CI, 2.2-6.5]), sexual risk behaviors (eg, first intercourse before age 15 years [for 1997, OR, 8.2
10 ncrease in the proportion of women reporting first intercourse before age 16 years does not appear to
11 Risk also increased with decreasing age at first intercourse, but this effect disappeared after adj
12 tumor types increased with decreasing age at first intercourse in this predominantly monogamous popul
14 aiming for many goals (eg, delay in onset of first intercourse, reduction in number of sexual partner
15 ontraception increased with declining age at first intercourse; reported by 18% of men and 22% of wom
20 lore whether child sexual assault and forced first intercourse were associated with risk of violent r
21 o were enrolled before or within 3 months of first intercourse with a male partner and were censored
22 emale university students who reported their first intercourse with a male partner either during the
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