"...male bonding thing." I agree. Nudity doesn't need to be at all sexual. IMO, it's a GUY thing to like being nude. I really don't think it's connected to being gay or straight.
I have peel-on/peel-off 'frosted' plastic on my windows, so I have privacy. My clothes are off most of the time I'm home. I do everything nude except frying. I belong to 3 male nudist groups so I can usually make at least one event per month despite my work schedule. There're a couple of male nude yoga classes run in my area. I'll start attending once I get clearance from my doc (arthritis, etc.). I also attend a naked bridge (the card game) class every week.
My boyfriend used to be an active social nudist, so he understands why I am. He doesn't put clothes on until he needs to go out. If he showers when he gets home, he usually doesn't bother putting anything back on, either.