Unfortunately, it's the truth of the society we live in. A woman can have sex every night if she wants to; she has to go out there and say yes. She can lower her standards, not take care of herself, and have zero conversation or wit. If she wants to get laid, she will. Men, on the other hand, have to take care of themselves; they need to have conversation, wit and game, and ultimately work really hard and even then its down to the choice of the woman if he's getting laid...
In laymans terms its easy for most woman to get it, its really hard for most men to get it. Hence why the woman gets a derogatory term and the male does not - its been like that forever and its not going to change anytime soon.