One significant difference in our school in regards to women sparring with men is that men can't hit women in the face. They can hit us in face and of course we can hit other men with face contact. That's been a fairly recent change. Also the guys don't kick or punch women as hard as they can. It's good that way though - as a guy, I think it teaches you a lot about control, much like fighting kids. You wouldn't blast some little kid across the floor, even though you could! Apart from that - everybody fights everybody at our school, except married couples.