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Sexual activity among US women of reproductive age.

New data on sexual activity among U.S. women collected by the National Center for Health Statistics is reported in the National Survey of Family Growth Cycle III and includes information on activity of never-married women and on premarital onset of coitus. 7969 women aged 15-44 were surveyed. The proportion of ever-married women sexually active before marriage increased with younger ages from 53% of women aged 40-44 to 83% of women aged 15-24. Younger ever-married women also were exposed to premarital sexual activity for longer periods of time. The percent of young unmarried women who were sexually experienced was 43% in those under 19 and 73% in those 20-24 and was higher among Blacks. This increased exposure is related to the rapid increase in the median age at marriage also more marked among Black women. Having initiated sexual activity does not necessarily imply high current sexual activity. Sexual activity in the 3 previous months peaked in women at age 25-29. 16% of these women were cohabiting. Levels of current sexual activity were higher in currently married women. These findings of higher levels of premarital sex for longer periods of time have implications for the increasing incidence of births among unmarried women their risk of exposure to sexually transmitted diseases including ADS and the relevance of health education on these topics for school aged women.