Here's a better question; would you consider it OK for your SO to commit Battery on you by virtue of her being a woman?
Would you consider it OK for her to slap you?
I am tempted to say I would be OK with her slapping me, especially if I was working out and obviously stronger, in rare circumstances-but hitting me, no. And I am already pissed off by a local woman who got acquitted after stabbing a man with a glass bottle because she was considered attractive. That says a lot about society.