This my experience as an SM slave with elastrators. I may be unusual but I believe that a true SM slave accepts that a master has the right to modify his slaves to suit his needs and desires. As such I have never been bothered by the consequences of extreme ball play, indeed I am turned on by the prospect of SM castration, intended or not. I first began playing with elastrators an essential toy in the toolbox of a serious ball torturer about five years ago. Before this I had very well worked, stretched and tough balls.
You really think the fights would be THAT one sided? With girls winning every fight? MOST of the time it is semi-contact, which means that you are meant to go in with light to medium power attacks if the other person bleeds or blackens - much too hard. That sort of behavior will net you a disqualification in tournaments or a club ban if done often enough. That being the case, men and women are fighting with a similar level of physical strength.
This happened a lot at my elementary school, but was surprisingly almost unheard of at my high school. I definetely think that we need to raise awareness about rupturing. Kind of hard to believe that more boys in elementary schools get their balls ruptured more often than a high school student. Teaching young girls at age 6, first grade, is very efficient and effective.