I was just playing around. But if a female needed to protect herself from a man, in my views it's very simple, and someone should say it, so I will.

If a man were to overpower a female, that would make him feel powerful. the last thing a man is going to do when feeling dominant and powerful is have his guard up protecting his chest area.

so it's simple. Hit the bastard as hard as you can with whatever part of your body, preferably your elbow or fist, square in the adams apple. the bastard will choke and not be able to continue whatever it is that he was doing.

be careful though, this can lead to loss of consciousness or even death if you get him hard enough.