Kathleen A. Early initiation of sexual activity is associated with more sexual partners, not using condoms, teen pregnancy, and sexually transmitted infection STI during adolescence. Most adolescents initiate sexual activity during high school.
CDC supports adolescent and school health efforts using state-of-the-art surveillance systems designed to collect, analyze, and disseminate data on youth risk behaviors and school health policies and practices.
This Web page is especially for teens and designed with input from teens. As a teenager, you have more power than anyone to prevent teen pregnancy and sexually transmitted diseases STDs. Find out what you need to know before you begin having sex. If you are having sex, you can protect yourself and your partner from pregnancy, STDs, and HIV the human immunodeficiency virus.
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