(This does not go for all men, but it goes for most of them)

"I'm not sayng that your wife is easy, but if she were a pin code she'd be 1234."
Why do people make jokes about women being easy to get in bed? Have you ever heard a joke about a man being easy? Would that "joke" above be funny if it were about a guy? Why is it okay for men to talk about sex and whistle at a hot woman walking by but when a woman expresses her sexuality by flirting or having sex she is easy? Why do men always say that they love big boobs but when they see one (on facebook parhaps) she is looked at as a slut or a whore who only wishes men to look at her boobs? Please explain this "logic".