Dudes in the showers at the gym is just awkward. Eyes forward, no looking at downward angles unless you need to stare intently at your shoes. It happens, but it's most decidedly not a big deal. And Yeah, you're gonna notice wang, but by no means mention that you notice wang. Ever. It just makes things awkward. And by the love of all things sacred never comment on someone else's wang. Things that are unacceptable to broach when wangs are out:
"Daaaayyyyyuuum!"
"Huh. Snipped, eh?"
"So what's it like to have a hood on your head?"
"Awww, dude, how do you even find that thing?"
"So, leans to the left, eh? Nice! *high fives*"
These are all completely on the "do not" list. Yeah, you're gonna know, but don't ever bring it up. It just means you can never talk to them again. Really the conception that we measure and compare our junk to each other is something created by, and largely for, women.