It is still cheating, even if nobody comes.

a bit on the side a play on words abstruse adultery affair ambiguity ambiguous ambivalent amour aphorism aphorisms aphorist aphorists arguable be unfaithful came carrying on catch catch read handed caught caught red handed cheat cheater cheaters come coming commit adultery cuckoldry debatable disloyalty doubtful dubious equivocal extramarital extramarital sex falseness fling fool around fooling around funny hanky panky hilarious humor humorous humour imprecise infidelity joke jokes language liaison obscure open to argument open to debate orgasm orgasms play around play on words playing around pun puns red handed satire secret semen sex sexual intercourse sperm spermatozoa spermatozoon sperms stray two time two timing uncertain unclear unfaithful unfaithfulness vague walk on walked on