During your teens you become sexually mature. If you’re a girl, you develop breasts and begin to get your period. If you’re a boy, your penis and testicles become larger. If you have sex, you could get pregnant or get someone pregnant. Whether you choose to have sex or not, it is a good idea to know about safe sex and how sex affects your health. Besides pregnancy, having sex puts you at risk of getting a sexually transmitted disease, such as herpes or genital warts, or HIV, the virus that causes AIDS.
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