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a relationship that revolves completely around sex, so much so that the people are not even considered to be "in a relationship" but simply just hooking up. it is different from a one night stand in that it lasts longer than one night and at least one person feels an emotional bond that most likely isn't even there.
Girl #1: Joe and Kate really need to stop their sex-lationship and either start dating or stop fucking.
Girl #2: Seriously.
by notgiven123456789 June 19, 2008
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