I just had an argument with a girl I know.

She was saying how it's unfair that if a guy fucks a different girl every week, he's a legend - but if a girl fucks just two guys in a year, she's a slut.

In response I told her that if a key opens lots of locks, then it's a master key. But if a lock is opened by lots of keys, then it's a shit lock.

That shut her up.