Anyway, I thought this might interest you and your readers. The cupper knows that the cuppee's balls are in hand, but feigns distracted ignorance. Gee whiz, it's pretty straight up. Grabbing some guy's balls in public and pretending like it's an accident is very amusing. Try it sometime.
Testicles are the great equalisers, men-wise.
Besides, balls look funny. They're all dangly and wrinkled and sparsely furred. They look like jellied lychees covered in a fuzzy mold. Seeing a guy's balls is a kind of conceptual power. The most impressive, powerful man immediately becomes a dork when you catch a glimpse of his testicles swaying in the breeze.