I'd say most guys are average, but with a dearth of the smaller-hung and a surfeit of the better-hung. Versus a typical shower room, you do see a lot more examples of penis giganticus than you'd normally expect. It's their chance to shine. The last time I went to one, just before my marriage, I saw two black guys who could find ready employment in porn any day. But, I emphasize, most guys are average.