I admit I was curious (you wouldn't be?), but tried to be discrete and not stare. It looked like it belonged on someone else's body. But his flaccid penis, hanging loosely, well down between his thighs, was simply enormous, at least seven or eight inches long, probably more, and thick, with an especially plump head.
His body was mostly hairless, his butt really small. When he first turned to face my direction in the shower, I was shocked! He was an average-sized guy, fit, slim, maybe 5'11' tall.