Was just ranting about this in class the other day. There is no insult for men that is comparable to the "slut," or "whore," (etc) that women get. Even "man whore" (which is problematic, as it suggests "whore," is inherently feminine...) carries a sense of accomplishment, light-heartedness, humor or prestige. It's super lame. I also don't mind people not being promiscuous, but vilifying, bullying, or passing sweeping judgement on a person for it is ludicrous, and is probably why I'm always getting into stupid fights all the time T^T