“Make sure you know your partner. You might think he or she is perfect. But they might have a sexual history before you, and they are too shy to let it out.”
—Joshua, 17, New Jersey
Semen
The whitish, sticky fluid that is released from a male’s penis during ejaculation. A typical ejaculation contains anywhere from a teaspoon to a tablespoon of semen, and hundreds of millions of sperm.
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