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| Sexual activity and outcomes |
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| vary
by region |
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| • | 71%
U.S. females/81% males sexually experienced by age 20 |
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| • | Puberty
earlier, marriage later, premarital sex more common |
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| • | pregnancy
rates declining in many countries |
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| • | 33%
give birth <20 in developing countries (20% U.S.) |
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| • | highest
rates of STIs= 15-24 year olds |
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