Almost half of U.S. teenagers ages 15 to 19 have had both oral and vaginal sex, The New York Times reports. According to new data from the Centers for Disease Control and Prevention, they were no more likely to have one or the other kind of sex first. These results challenge a popularly held belief that teens who are not ready for vaginal sex first experiment with oral sex. Since teens are having both kinds of sex at about the same time, researchers say that comprehensive sex education should include information not only about preventing pregnancy but also about preventing sexually transmitted infections.

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