Where I went to boarding school...guys had a big shower room with 6 shower heads, girls had separate little stalls. Those showers were designed in the 1960s and were probably based off a design that dated back to the 20s...when modern plumbing was introduced. I'm sure the gang shower was a matter of utility...it would have been expensive to create individual stalls. A luxury like that was considered appropiate for the delicate female psyche, but young men were tougher and more practical. I'm can imagine talking to a 1920s architect: "Why don't you supply boys with separate shower stalls?" Architect: "Are you crazy? We can't afford all of that haberdashery. Besides, I bet they enjoy the camaraderie and talking to each other about sports and other nonsense in the showers. You know how boys are."
Of course, those days are over. The health club I go to has little shower stalls for men and women - I know because I walked the building while it was being built. We are rich now, and can afford such haberdashery as tiled shower stalls. Women are no longer known to be delicate, so whats good for them is good for the guys too. Equality, you know. Besides, we have such things as homosexuals these days that actually enjoy checking out their fellow men. Throw in a few cell phone cameras, Abercrombie and Fitch ads, paranoid parents, and Viagra and its just safer to avoid male nudity altogether.
Right?