My argument has nothing to do with parents or doctors addressing medical emergencies and if my kid has injured genitals he or she is going to see the most available doctor who is most competent to treat that injury.

I'm uncomfortable exposing my genitals to female nurses and doctors but I do it if it's necessary for treatment.

When I said, "sex ed class," I was referring to a father bringing his daughter into the men's changing room specifically to see male genitals. Same deal with a woman bringing her son into the women's changing room. I was not referring to your school instruction.

As to the worry of false allegations, I was more concerned about the parent mistaking a look of surprise or shock for some kind of salacious look; a parent thinking that perhaps an adult is purposefully making him or herself overly conspicuous in order to expose themselves to the child; comments from other adults about the child being taken the wrong way; etc.

True story: I went to a gym I frequented and after my workout threw on my towel and went into the sauna for a good sweat. I walked right in the door and in there was a father with his two young sons who appeared to be around 7 or 8 years old. He and the kids were wearing swim trunks in the sauna. Everyone else was wearing their towels. I had never seen anyone in this sauna wear a towel before and immediately I became uncomfortable because if I did remove my towel I thought the father might think I was acting lewdly in front of the kids. Apparently everyone else thought so too. I felt so uncomfortable thinking of all the possible ways this could unfairly compromise me that I got up and left after less than a minute. I actually would have been slightly MORE comfortable if the kids had been nude, but even then that raises some issues as I once was in a sauna with a young boy who pointed at my penis and said, "His penis looks just like mine!," because I'm very small and retracted when I'm flaccid. I was mortified, the father apologized, and I chalked it up to, "shit happens."

I like the idea of family changing rooms and if a parent or kid isn't comfortable with one or another parent changing with them then don't take the kids into that kind of a situation! It's simple as that. Work out these issues before you decide to go to the water park/gym/public pool.