Why don't more girls just hit abusive guys in the balls?

Just wondering why so many girls don't fight back from abuse. I've been punched in the balls before from a girl (by accident) but it was still hard enough to feel crippling, and it really humbled me and made me realize there are literal babies hanging between my legs.

So why do so many girls just let guys abuse them?
Why don't more girls just hit abusive guys in the balls?
Post Opinion