chicagoil: I can relate to you. I get semi hard most times when I'm at the gym taking a shower, getting dressed, etc. And I'm at the gym quite often - 5-4 times a week. So even with the frequency of my visits, I still haven't gotten quite used to it.

Most of it is my shyness when I'm nude. I too think of nudity as a sexual thing. I didn't play sports in school, so I never had the occasion to take showers with other guys before I started working out at the gym as an adult. So I never had that conditioning. But the sexual part is a big part of it too. When I see other guys' dicks, I am turned on by the sight of some of them, so naturally I can't help my reaction - an erection. But the general sexual nature of a nude guy - seeing his sexual organ and the part of his body that gives him sexual pleasure causes this response.

Most of the time I'm able to cover up. I am not huge by any means, so this helps. Most of the time I cover up with a towel wrapped around my waist, and if anybody has seen my semi-hard on under my towel - if they were able to tell I was getting an erection - nobody has ever said anything. Or I cover it up in other clever ways - carrying my toiletries bag in front of my crotch or the boxers I've removed before taking my shower.

I too get nervous that somebody would say something if I sported an erection in the locker room. But like some other guys have said, even a hard penis is a natural thing, so I don't think anybody would say anything. I would certainly notice something like that, but probably wouldn't have the guts to say something to the guy.