Laura Bates said this quote

A slut isn’t a person, it’s in the eye of the beholder. Like beauty, or an annoying eyelash. We decide who a girl is based on something she’s done (or even just rumoured to have done) and then brand her with it as if it’s a permanent part of her identity. Guys, on the other hand, get to wear their relationships and ‘conquests’ like medals or badges of honour, which are much easier to take off, and hurt a lot less.