I think we should have 100% equality. Arrest the person committing the assault. No matter the gender.
You'll have a LOT less women slapping guys. And in turn, guys won't turn into pricks like Ray Rice and over-react by punching a woman out for a stinging slap.
The mens' over-reaction means they deserve jail time. HOWEVER the initial female's assault means she should be locked up ALSO.
Ray Rice's wife was spitting on him, slapping him. If a MAN spits/slaps, he goes to jail. If she does it, zero charge. That's wrong.
Charge 100% of people with assault, and it becomes a heck of a deterrant. I'm in clubs all the time - many people DO think a woman can slap a guy and get away with it - and the bar usually laughs at a man getting slapped by a woman. Let a man backhand a woman in front of the bar, you'll have 50 "heroes" stepping up to assault him".