We all know that hitting women is wrong. Not only because you could go to jail, but because they are often the weaker one in the relationship. Using force to get your way is abusive and should not be tolerated.
In the early 1900's to about the 70's it was pretty common that women got smacked around and something needed to be done to protect these women. If a woman said you hit her you were going to jail, marks or no marks. Over the years, however, women have started to use this as a form of revenge and even as knowledge that they can let out their anger in a physical manner with no ramifications what so ever. It is gotten to a point where it has been joked about many times. Here is a skit from Bill Burr about an ex girlfriend. The part I am referring to starts at 2m 30s into the skit. (It's all funny though if you havent seen this guy)