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The act of sticking your penis into a pregnant woman's vagina (preferably sooner rather than later for more ease), and using it as a vacuum to get rid of the fertilised egg. Often a last resort when no contraception was used, and abortions are out of the picture.
Michael: Dude, I banged her so hard the other night, I came inside. It was great.
John: WOAH! Is she on the pill then?
Michael: Nah, I unsexed her the next day.

Linda: What can I do to get rid of the baby?
Doctor: If you can't afford an abortion, you can get your boyfriend to unsex you instead.
by Leave-Me-Alone January 14, 2015
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The opposite of sexin. It is known to make people shorter. If some people were to have sex, their sexin levels would go through the roof. They would need unsex to bring it back down. To make it easier, cigarette companies started shoving unsex in their cigarettes. This is why people smoke after sex.
Look how short that midget is! his parents must be full of unsex to make him that short!
by LordBFG April 28, 2008
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