I haven't read all the posts, probably just 10-12. It seems like everyone here is supporting the fact that you get erections in the shower/locker room and you shouldn't think anything of it.

I also think that everyone here wants to screw you big time. Not sexually, but as a joke. Don't listen to them, outside of a West Hollywood gym or a predominatly gay gym you will be perceived as a complete weirdo. If I was standing next to you I would probably pretend not to notice but would definetly want to distance myself.

I think the majority of people will think you are showing for a reason, not just because it happens. Most straight guys that I've met would think your gay immediatly. If thats not the impression you want to give do not do it.