When you've had sex with someone but for one reason or another, neither of you reached orgasm. This leaves you feeling afterwards like you haven't had sex even though you have; frequently this means you want more.
Bro 1: Dude, why are you still thinking about her, didn't you two get it on at that party a few weeks ago? Move on, man!

Bro 2: Yeah, but we got interrupted before we could finish. Unrequited sex just leaves me wanting more.
by snowscape October 9, 2011
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