A party that is disguised as a typical type of party, but really requires you to have sex throughout the night; Obligated sex with multiple people; Raping is involved. The Amazing Allie from Hyperboleandahalf.com coined this phrase.
Guy 1: Jill invited me to her Halloween Party. You goin?
Guy 2: Nah, the only type of party she has are "mandatory sex parties"
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