Why do girls kick guys in the balls?

And how is that different from guys hitting girls, making them collapse in pain, and risking mutilating their genitals?
Sometimes a kick in the balls causes a testicles to rupture. How is that different from ramming a knife up a girls vagina?
Why shouldn't boys hit back girls, when they kick them in the balls?
Why is this always presented as not a big deal in the media?

I don't care what the reason is. If it isn't a reason for a guy to hit a girl in the abdomen so hard she collapses, then it isn't a reason to kick a guy there either.
Why do girls kick guys in the balls?
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