Girls: what is so funny about kicking guys in the balls?

I was sort of wrestling around with my girlfriend and out of nowhere she just kicks me in the balls as hard as she can. And then she just busted out laughing😏. I have a high pain tolerance so I didn't fall over or anything but it still hurt some.
I actually felt like kicking her back but it won't hurt her as much
But I am still wondering what girls find so funny about kicking balls?
Girls: what is so funny about kicking guys in the balls?
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