Scientific reference for 'doing the dirty', having a 'no pants
dance', or advancing courtship. Coitus is commonly used in a
popular TV show, The Big Bang
Theory.
Penny: *opens door* "Hey, my power's out, can I stay here for the
night?"
Sheldon: "Do you really-"
Leonard: "YES, of course...th-that's what
friends are for, after all. Lending a room in a time of need."
Sheldon: "Well...as
long as this doesn't end up in Leonard and Penny taking part in coitus, I guess I can live with it for one night."