This is going to sound bad but I have a run in with a girl one time that simply would not let me leave without fighting her
now I didnt hit this girl but I did take her to the ground a softly as I could
but then she went for the man area , and well....that I was not about to let happen
so I kind of kneed her in the face
I felt really bad but that can cause serious damage...
and now I have a 2 rules
1.
A girl can hit you 3 times, when the 3rd hit lands you can retaliate with one hit as hard as you can
but not in the face, aim for say the arm or chest XD (that would teach her

) but nothing visible (say a bruse or something can be seen)
2. If a girl is bigger then you, AND can more then likely kick your butt because she is bigger then you, it is no holds barred, you strait defend your self and if she gets hit it is her own fault
I have followed these rules for 19 years and it has never steared me wrong ^_^
kind of evens the playing field a bit XD