Perhaps this is a generational thing. Or, an attitude thing, I don't know.
My first experience with group showers was in grade 7 phys ed, when I was 12 years old. Puberty had hit me like a ton of bricks when I was 11, and I was the only guy in the room who had started the changes. I was certainly a curiosity, but our phys ed teacher hammered it into our thick skulls that after physical exercise, we all stunk to high heaven and needed both a shower and deodorant. Thus it was presented to us as an issue of hygiene. He stayed in the shower with us, not because he was a perv, but because he could (loudly, so that all could hear he was applying the rule fairly) tell the reluctant boys that they weren't leaving till they showered. It was a big deal for the first two classes, then we smartened up. The teacher would also not allow any teasing or comments about any of the naked boys in his presence there in the change room and showers. One guy got a hardon, and the teacher's only reaction was to say (again, loud enough for all to hear) "Nice hardon Matt ... good to see you're normal". After that any and all hardons were a non-embarassing issue, and while noted, no comments or teasing resulted. One kid tried to be cool by making fun of my pubic hair, and was quickly corrected by the teacher, who called him a stupid ass, the same thing was going to happen to everyone in the room, in their own sweet time. We thus learned that the only thing worse being the first to go through puberty was to be the last to go through puberty, but at the end of the day, we all got there regardless.
I don't know about Midwest or Southern Baptist attitudes (I am Canadian) but I just have to relate that several years later, while driving my car, I scanned across the FM band looking for some good music. The radio stopped at an American station, where an evangelical / Baptist preacher was urging the congregation to "help our youth". Or something like that, there were spontaneous shouts of "hallelujia" and "Amen" from the congregation.
Unfortunately, the dear man was pronouncing it "poooooburty". I was laughing so hard, I damn near hit a guardrail.