This documentary has compelling arguments about nudity in schools and public swimming pools : hygiene, technical issue for cleaning the pool, as well as freedom, pleasure of swimming naked.
When I read that some guys were bashful and dreaded to get naked, it is probably because they were raised to be ashamed of their body. Besides, mothers who protest are somewhat responsible for the body conscience issues.
I remember how embarrassed I was in the locker rooms for swim class, trying to hide my buttocks and genitals with my towel.
Two years ago, I was in the US, and attended YMCA gym classes. I wish they would offer naked swim classes again ! I think people are uncomfortable with their bodies because they have a bad self-conscience. It would free them from these psychological hurdles and start life with new and saner living habits. Changes would occur steadily.
Thank you Markus for bringing that up!