There is no word in the English language that means “a hit or kick to the groin.” For the sake of this conversation, I'll coin a word for it. “Thwop” is good. It sounds like a good solid hit to soft tissue, and it's a terrific opportunity to use onomatopoeia in real life.

- Ellen Snortland, Beauty Bites Beast

Is it possible that there is some sort of metaphysical justice in the anatomical fact that the male sex organ, which has been misused from time immemorial as a weapon of terror against women, should have at its root an awkward place of painful vulnerability? Acutely conscious of their susceptibility to damage, men have protected their testicles throughout history with armor, supports and forbidding codes of “clean,” above-the-belt fighting. A gentleman’s agreement is understandable — among gentlemen. When women are threatened, as I learned in my self-defense class, “Kick him in the balls, it’s your best maneuver.” How strange it was to hear for the first time in my life that women could fight back, should fight back and make full use of a natural advantage; that it is in our interest to know how to do it. How strange it was to understand with the full force of unexpected revelation that male allusions to psychological defeat, particularly at the hands of a woman, were couched in phrases like emasculation, castration and ball-breaking because of that very special physical invulnerability.

- Susan Brownmiller, Against Our Will