A nasty ass, musty smell that permeates the apartment of a horny couple or a high-sex dorm room. The smell usually builds
over time because the couple fails to practice proper hygiene, clean the sheets or open
the windows. Usually causes
normal people to want to vomit.
Couple A: Come on in, make yourselves at home. Sorry the apartment's a bit messy.
Couple B (to themselves): Damn, their apartment has that sex smell.
Disgusting. (They vomit.)
_________
Dorm Guy 1: Dude, open some windows, this place is developing a
nasty sex smell. I can't take it anymore.
Dorm Guy 2 and
Girlfriend: Really? We don't smell anything.
Dorm Guy 1: That's because you're used to it, filthy animals. Now clean your fucking sheets and let's open up some windows.