Call up an ex. Heck, call up any woman. Go out drinking with her until 4am. BE SURE TO DRUNK TEXT YOUR GIRLFRIEND! (Pics of you and the woman together are a bonus.)

If it's the end of your relationship, at least you'll know that she's playing with double standards. What's good for the goose is good for the gander.

And please don't give me this cultural stuff. I think cultural sensitivity goes too far when we have to sacrifice our own standards for what we find acceptable in a relationship.