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Anonymous who is convinced that females are given a free pass on domestic violence--where are you getting your data? My mother works in conjunction with child services, and I know for a fact that in her area it doesn't matter if you're male or female, or even if what you did had any chance of hurting the other person. Make a violent gesture, you just get locked up.
All of these sorts of laws vary state to state; enforcement guidelines may be even more local than that. If the enforcement of your locality isn't to your taste, dude, write a letter. I don't think the situation you are talking about is typical in this day and age.
But seriously, folks, are we all pretending we don't understand what's going on most of the time? Women hit men to make an impression, not because they think they can hurt them. There are exceptions, of course, but mostly it's "I'M UPSET AND YOU ARE NOT LISTENING TO ME SO *smack*" It's like when a small child lashes out when it's not getting it's way. Fundamentally, it's an expression of powerlessness.