I suppose this is strange and unusual, but every time I'm hiking or on a camping trip and have to take a leak by the nearest tree, I get a sudden hard-on. Maybe it's the fresh air on my dick. Maybe it's because there are usually one or two other guys on the trip and we usually all stop for a pee at the same time, and it arouses me to think of all of us standing their with our cocks out. I don't know, but I don't think the other guys get hard. And this isn't something I can easily hide, even when turned away, since the stream will give me away. Still have never been "called" on it. I always get hard when going commando, too, maybe for similar reasons, which is why I seldom do it. Anyone else?