Its not uncommon to see a guy in the shower area 'washing his cock' and looking around to see who's observing him. Heck, I've faced outwards and done it to be seen too.
But there was this one time I was done showering, dried myself off, threw my towel over my shoulder and walked back to my locker (purposely the furthest away from the showers). Another guy was about 6 lockers down just arriving and starting to get undressed. He caught a glimpse of me looking back at him, and I gave a slight head nod and said "hey". Then, I caught him looking back at me again, but his eyes looked at my dick first. By then, he was down to his underwear and about to take them off.
Somehow, we felt a mutual comfort with each other and he said, "Have you been a member long?" (Small talk / ice breaker conversation) By then, he had removed his underwear and was totally nude - only holding his folded towel under his arm and my towel was now draped over my locker door. We were in a somewhat secluded area since it was the furthest from the showers and urinals. We ended up chatting nude for about 20 minutes, neither of us in a hurry to go anywhere. He was a married guy and so was I. So, I think that kept us from doing anything further. We exchanged glances at each others cocks. And, there was the occasional 'cock adjust' of our slightly fuller hanging bulges to acknowledge being looked at. He asked me about my shaven body hair routine, so that gave us a little freedom to 'look' at each other's body and break eye contact - although I focused on his cock, which was about the same size as mine. It was a nice experience.