It really depends on the situation. If this woman is more manly than most women, then I'd say probably. Self defense then.
But if its a normal type of girl, then it depends where they hit you. Cause let's face it, if a girl hits a guy like a slap in the face or a punch somewhere other than the privates, then she's not going to hurt you. But if you were to do the same, then you are going to hurt her.
I'm a strong believer that a guy should never hit a girl unless in a case of self defense or they make a low blow. Remember facts of the matter are you can hurt here a lot more than she can hurt you. Girls shouldn't hit guys either, but most of the time we deserve it and they aren't going to hurt ya.
I'm not being sexist at all, just going off of experience.
