Or we could just have regular locker rooms like the high school I went to and let people explore their sexuality on their own time.
Well personally I mostly get that this is complex intellectually, I have bathed with people I know to be gay, I don't care, I have been in public shower, while a cleaning lady began to clean the floors, I didn't care neither did the other mens in the showers, we all just ignored her. If I had to shower together with naked women, I would do the same as when I shower with naked men; ignore them. So this person could share locker room with the girls, the boys, having a private one or the school could have a uni-sex locker room. But you people live in another cultural context, so I get it's complex for you people.