I know for a guy, sex is over once he ejaculates. But when is the sex over for a girl? Because I've always been told in sex ed that the guy is "finished" once he cums & that girls don't always ejaculate during sex. But I never really thought to ask about when a girl is "finished." So when does a guy know the sex has finished for both, if the girl doesn't always "finish off" like guys do?