Yeah, I have a problem getting a boner in the gym showers. In high school they thought I was being abused at home because I faked so many injuries to get out of gym!
Now I think a lot of really unpleasant thoughts (you can just imagine) because if I think for one second about not get a boner, I get one. I'm embarrassed, but I have never gotten any crap over it, I just don't think it is cool. I'm scared that some homophobe will bash me for it, or I'll bump into one of my friends and it will get around. Some days I like it, with a big half-boner swinging, showing off to other guys, catching thier glances.
I guess I just never got over high school.