Maybe what is wrong is having communal changing rooms and showers, and not some people?
I was surprised, but not shocked, on viewing my old school with my son - I checked out the changing rooms and the communal showers are all gone. What seemed most strange though was learning that the kids just don't wash after PE now.
We are a bit hung up about it all though. In some societies mix gender nudity is really not a problem, but we tend to confuse nudity with sex and this is he cause of all these problems. In societies where clothes are not worn, nobody cares.