The issue I am concerned with here is society's orientation to testicles in general and how this reflects the relationship between men and women.

Testicles are often seen as a sign of masculinity, strength, and power. Sometimes, testicles are flaunted like peacocks' feathers: the bigger your "balls", the more manly you are. Oftentimes warriors, sports icons and other masculine idols are described in terms of having "balls of steel" or similar phrases. There is an apparent correlation between heroism and having testicles. If you do not have the courage, you are often seen as not having testicles. In this sense, having testicles means having courage, etc. This seems to marginalize heroes who are women, who do not have testicles themselves.

I believe the society I live in finds testicles to be a source of sadistic entertainment. It is a common trope, especially in film: a man gets hit in the testicles and comedically falls down in pain. This is supposed to be funny. However, most other forms of pain-inflicting violence are not funny. It is not usually funny to hit, stab, shoot, or otherwise assault another person. But hitting a man in the testicles is a trope that has a long history of being amusing.

My question is, why is this? Why is seeing a man succumb to intense pain by being hit in the testicles, funny? What makes this funny? (I have never found this funny, myself)

In my own experience, I have met many women who seem to relish in this humor. They do not just find it funny, but also find it vindicating, to see a man succumb to a hit to his testicles. From my perspective, it is as if they think the man deserves to be reduced to a helpless creature, curled up in the fetal position. I have detected an immense amount of rage, bordering sadism, in these women. They not only find it funny, but some would also like to personally kick a (certain) man in his testicles. And society at large seems to excuse this sadism.

These experiences make me believe that society does not care if a man is hurt when he has his testicles damaged. Testicles are a source of amusement. But furthermore, I believe the rage and sadism held by some women with respect to this is a sign of patriarchal oppression. The fact that they enjoy seeing a man writhe in pain is an indication that they believe this man deserves to be punished, that he deserves to be "stripped" of his power. In a patriarchy, men have power over women. The fact that a man has an extremely vulnerable pair of external organs is a way for women to seek "revenge" on men for their oppression. It is a way of leveling the playing field, so to speak.

In this way, testicles are both a representation of pure masculinity and a vulnerability that betrays this very same masculinity.