I was wondering how much hand squeezing pressure the balls can take before they break. I don't think I have ever met a woman who could pop a ball by hand squeezing it.
On the other hand, I find it intriguing that women are savvy enough to know a ball can be broken by repeated stomping. While I found it a little unsettling, "Mommy's Nutcrackers", a story about a mother who crushes her son's testicle by standing on it, I also found it very erotic.