I'm older than most people here. My dad was an Army lifer and I grew up on military bases in US and Europe during the Vietnam years. Army schools, Army gyms, Army hospitals. Communal showers, even communal toilets. (2 rows of five toilets so when you crapped you faced a man looking directly at you. I remember my dad conducting a meeting while taking a shit, his junior officers standing around no big deal. My mother, however, did not like important family discussions taking place while dad crapped.) Army pools did not require trunks during all-male swim hours -- lots of bad jokes from the well-hung that they were at competitive disadvantage during races.
New England prep school and college were more or less the same. Toilet stalls finally had doors. Locker room nudity was no big deal. Or if you thought naked men changing clothes and showering was a big deal, you had outed yourself as a weirdo/freak. Every day for four school years I saw my best friend naked in a team locker room and I have no idea what his cock looks like. For all I know, he's hung like a Ken-doll.
Once I started working in NY and Chicago, I joined several men's clubs known for their discriminatory membership policies and bad food. Again, lots of casual nudity in the locker rooms, showers and pools. One club posted a sign saying clothes were required in the weight room.
So I found this thread curious. I have never seen anything untoward take place in a locker room or shower. (And I have had and continue to have a wild sex life that approximates your average college boy's fantasy life.) Locker rooms, to me, are among the most asexual places I've ever seen. Naked men with guts, surgical scars, old war wounds. Plus a few super-fit men who are often world-class athletes. Yes, younger men are perhaps a bit more prissy about wearing a towel as they walk between locker and shower but I chalk that up to their own issues. Not a generational thing
Or maybe it a cultural thing. Men from English-speaking countries, Germans, Scandinavians and Japanese are usually very casual about nudity. Still, the topic is not one I ever paid attention to. As I said, this is one peculiar thread. Had no idea lots of men here think twice or thrice about letting other men see their dicks in the locker room.