extramarital sex:

Adulterous sexual-relations . See affair for synonyms.
See Also: a bit on the side, bit on the side, carrying on an affair, comarital, eating out, fan one's ass, getting a bit on the side, go on a fishing expedition, hit the triangle, join giblets, join paunches, joint, kidding around, left-handed honeymoon, outside sexual contact, play checkers, proposish, ride, sexobatics, shoot the thrill, swinging, tail-femme, transexion, wear the ring

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