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Similar in context to "WorkWife", "FuckWife" is the term used to describe the woman with whom you're having kinky, fucktastic sex because your "RoomWife" (roommate+wife) just 'isn't into that.'

While "mistress" is a synonym, "FuckWife" is more applicable to the woman with no shame in her game and simply out looking for orgasmic-kinky-fuckery.
I married my RoomWife but work out my kink with my FuckWife. Best of both worlds.
by ThreeIsGood July 09, 2016
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