By now, my childhood seems a lifetime and a world view away. Oh, wait a minute. That's the way it is.
I spent my early childhood in a town of fewer than 1,000 people in New Jersey! It seems so strange now to think of any place 50 miles from Philadelphia and 50 miles from New York City as a rural backwater community. But that's the way it was. We had no movie theater, so I missed that whole experience that others I have met in life enjoyed growing up in the 50's. They learned something about the rest of the world through films. I didn't. And I also learned nothing about male bodies and male bonding through nudity. Why? No community pool. No gym in that four-room school house. Nothing of the sort until my family moved across the country to Washington state in my 9th grade year. Talk about anxiety. I went to my first gym class where I was expected to bare it all and take communal showers at age 14 -- as a woefully ill-prepared 9th grader in a middle school setting. The point? It came as a shock, and it was unsettling. But the good part? The culture of the time was supportive. It all was presented to me as the natural thing go do. And it quickly came to feel right. Yes, it didn't take long to like seeing what the other boys had to show. And I soon liked showing what I had too. In short, the experience was presented to me as "what guys do," and it all felt right. I really think today's helicopter parents have deprived their coddled kiddies something important to normal life.
In some ways, my upbringing was similar. I didn't have to deal with communal naked showers at my high school, but I did at the Boy Scout and coastal summer camps I went to, as well as swimming pool locker rooms at the university-sponsored summer campus programs I attended. I'm 49, so these were in the early to middle 1980s, in the South. At the Boy Scout camps, scoutmasters and counselors showered with us; at the coastal summer camps, counselors showered with us; and at the universities, professors showered with us. It was--as you said above, Pecker Check--presented as "what guys do."
So it was both relaxing/normal and fraught with sexuality because I was a young gay guy looking around at all the scenery. I had to learn to control myself rather quickly (and fully); hard-ons weren't OK at all, and they couldn't be laughed away as "he has a mind of his own"--because homophobic boys would ask, nastily, "Well, what's he thinking about, then?"
These days, communal nakedness can vary from startlingly/electrically sexual to mundane/prosaic acres of unattractive skin on display (including mine, I'm sad to say--I've got to get back into shape). Sometimes you can even see both extremes in the same locker room or communal shower at the same time. But it is still "what guys do," even though more recently, younger guys have looked at me strangely when I got naked in a locker room or even asked me why I was "showing off" (when I was just walking to the showers with a towel in my hand, wearing nothing but sandals).
The world has well and truly changed, in this regard, which is why I was so stupidly nervous the first time I went to Haulover Beach just north of Miami: I'd internalized that new fear of letting someone else see me naked. But after I got over my body consciousness, it was a truly liberating experience. My husband and I have gone back several times, each time enjoying the freedom of being naked outdoors.
NCbear (who went all over the place just now in my reply to Pecker Check's well-crafted, succinct post)