The problem is that there really are women who participate freely in such activities. I'm sure many of them are severely messed up emotionally and mentally, but the government just isn't qualified to override a person's statement and determine that her actions aren't "really" consensual.
If you don't believe me, the evidence is remarkably easy to find. Some of the tamer stuff can be found in discussions of "domestic discipline," many of the blogs by women who approach the subject from the idea that it's an application of Christian principles of headship.
From there, it heads off into some really, really dark stuff. It appears, surprisingly, that there are a lot more people who want to be sexually dominated and abused than there are people who want to do the dominating. Hence a thriving and profitable market for the professional dominatrix.
I guess the paradox of feminism is in the heinous observing woman really needing attention and observation. I have heard women saying they got with their man because he “completely dominated them” at the time.
The government always finds it perfectly fine to attack tax payers and men in marriage, but never the hoards of illegals and the armies of pimps and their deranged willing amazon soldiers.
Oh... we pay them to do job and they keep weapons to avoid doing it.