orgasm facts

Illustration: Jen Troyer

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The Happy Consequences Can Last for a Lifetime
There's a theory among biologists that orgasms evolved as a way for females to "choose" which males fertilize their eggs. What we know from studies with animals as well as humans: Orgasmic contractions create a vacuum effect that may help the sperm get where it needs to go, explains Menno Schilthuizen, PhD, a professor at Leiden University in the Netherlands and the author of Nature's Nether Regions. It's by no means the only factor that affects your fertility, but it's certainly more fun to track than basal body temperature.
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