Attacking a girl's genitals, whether for fun or for reasons of self defense. While not as easy of a target as a man's testicles, the clitoris is every bit as sensitive. Even a playful slap, while not particularly harmful, can still be enough to make a girl double up and fall to the ground in pain. On the other hand, a full force kick can crush the clitoris up into the pelvic bone, compressing it. Since the clitoris is so tender, this will cause the girl incredible amounts of pain, and in some cases, severe injury, such as vulvodynia, bruising of the vulva and clitoris. In extreme cases, the girl may experience bruising to her pelvic bone as well. Severe cases of cuntbusting also carry the potential of emotional trauma, since the average girl tends to be more sensitive than the average boy.
For some reason, a surprisingly large number of (mostly younger) girls are unaware of their genitals' tenderness. Yet when kicked full force in the groin by the same person, girls are going to suffer just as much (if not even more) pain as boys, because of the double shot on the clitoris and the pelvis. The clitoris is located slightly higher, so when kicking a girl in the groin, the attacker aims higher and hits the clitoris and the pelvis, which is located right behind it. On the other hand, the testicles hang lower, so when kicking a boy, only his testicles are hit, and not his pelvis. It's still incredibly painful for a boy, but he won't have pelvic bruising to add to his injuries.