What is On Her Not In Her?
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during heterosexual sex, the man removes his member and ejaculates onto his partner's skin, rather than inside her, such as to lessen the odds of pregnancy when forgoing a condom
"You got her pregnant? I thought I told you, 'on her not in her'!"
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I'm guessing you're curious about why so many movies, tv shows, and games reference this aren't you?
Alpha Centauri is ..