I've never been in communal living such as school dorms or military barracks or even used shared showers, however just the thought really weirds me out (even scares me a little). Privacy is the one thing I value in a domestic setting.
The one thing that always bugs me is... well the explicit privacy stuff, especially when it comes to males. Males actually HAVE to relieve themselves, especially the younger ones because their bodies produce much more while also not being able to reabsorb it. But even if none of that was true, males still tend to be complete horndogs even without any need to do that stuff. So not only does my own lack of privacy freak me out, but even as an asexual living with (often a bunch of) guys that are going to have heightened urges and indulging themselves all the time is just... I cant bear even the thought.
Plus I'm a girl, but most times trans females are still put with the males so as you can imagine that's even worse for me.