I use to work in a meat packing plant. it was a hot smelly job and we all showered before going home in the afternoon or most of us did anyway. We all saw each other flaccid but never saw an erection there.
There was this one black guy there that would strut around the locker room with about a 6" flaccid very slim cock swinging. We all thought that he had a monster cock but one day he was bragging to me and said. "This mother fucker is 6" long when I get hard", like that was unusual. It was at this point i realized that you couldn't not tell who was the largest man there based on what we were seeing everyday. I was an inch longer than what he said he was and I know I was a lot thicker than him. But looking at the tow of us in the locker room everyone thought he would have been much bigger than me. He had me by a good inch and a half flaccid.