yeah, its a power thing. I noticed how here in the US, many women see sex as a barter system. Even with little things: straight girls touching each other telling men how its ok if girls touch them but not guys. Girls treating sex as a milestone in a relationship (inversely as guys considering it a conquest) as opposed something to be shared. On the radio, the show, tom Likas (sp?) tells men how to get sex out of women for under $40 in a date. This makes sex the "end" of the relationship. Inversely women make it a task for guys to "get" sex as opposed to sharing it.
this is perhaps why sometimes its not necessarily the prettiest woman that is the most desirted, but the more sexually confident women, which some may perceive as the "looser" women. There have been many of times that the "accessibility" to a women sexually has made her way more attractive than her explicit beauty. The fact that she is comfortable with sex and appears interested in the same thing you are: sharing each other, is what makes her attractive.
As another observation, albeit grossly generalizing, I found more tomboyish women attractive over the girly girl who only had girlfriends in her life as opposed to male friends. The girls who have closed senate sessions amongst themselves at starbucks, tearing apart every little attribute of yours, over analyzing something you might have said in passing. Its kind of an analysis paralysis. They almost lack a sort of emotional intimacy with their boy of interest as it becomes secondary to what her girlfriends think. meanwhile the tomboyish girl seems to have a more comfortable relationship with men to the point where the guy might just be a friend that she fucks, regardless of what her friends think.
whats this have to do with hurting guys balls? Well, just a little psychology behind the act. But I see it no different than when a guys attacks a girl for having anything more of a salad for dinner or something like that. When sex isn't treated like a scandal and more of just a fact, then perhaps there would be less of an antagonistic relationship between men and women.