When is it okay for a man to hit a woman?

In my case, I'd hit anyone who even hits me (except for my parents perhaps).
So therefore, I don't have any problems hitting a woman (given that they hit me first.
However I will never attack someone unless they attack me first. Thus if a woman slaps/hits/punches me intentionally and painfully, I definately would strike back without hesitation.

You should know that the vast majority of men, if they see this, will do their best to send you to the hospital.