Ok, i’ve got a weird one for you.
Will-o-the-Wisp - a Portuguese musical (?)
There’s a long, five minute scene in a locker room where half the firemen are in jocks and the other half are nude. There’s a musical number. It’s weird and erotic. Also look for the 69 scene.
I tend to wear “fashion jocks” (usually swimmer) for regular daily use, and regular jocks at the gym (sometimes 3”, sometimes swimmer depending on mood)… which means I change to and from in the locker room.