Is it common for girls to hit their brothers in the balls?

TonyAnd
I was on the bus from school when I herd two girls talking about kicking guys in the nuts, apperently someone got kicked in school that day. One of the girls had never done it but the other one said that she had done it "millions" of times. She said that she sometimes kicks her brother there just for fun. She also said, after the first girl asked, that her mother usually doesn't give her any punishment for doing so and that she probably think its funny to. Is this common? what's your experience? I don't know these girls, I just know who they are so I didn't dare ask them. The brother is about 3-4 years younger than the girl, do you think it's more common if the boy is younger?
Is it common for girls to hit their brothers in the balls?
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