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1.
when you live with roommates but can't wait for an empty house to get it on, so you have sex in your walk-in-closet to keep the noise down
Babe, I really want you right now! Ahh, I wish we were alone. Can you be quiet? Not really...it's not that fun that way. Okay, let's go for some closet sex.
by DestinyHope February 13, 2011
 
2.
Closet Sex: when your fucking a girl just because its an easy lay, but you dont tell your friends because shes fat or ugly.. so you keep her in the "closet"
if you have ever fucked a girl, even if she is ugly or fat, but didnt tell anyone, you have had closet sex.
by Hot_Deli_Dan November 19, 2007