The other day I was in the shower at the local gym and a well-built man with a very large penis began jumping up and down while he was in the shower. His penis would sway from his stomach to down below on top of his balls. I watched this and kept thinking--knowing my balls as I do--that I couldn't never stand that. That kind of movement is what they make jockstraps for. He did it for a while. All I could do was ache, but it obviously didn't effect him. Later on, as we started talking in the locker room I found out that he was a former boxer. Made sense. The jumping movement was the kind a boxer would make. Still I thought it was a bit strange.