I know it's kinda weird to say but sometimes I'll just look in the mirror when I'm nude, and get aroused. I like the shape of my butt, the flatness of my stomach, and the size of my dick. While I'm outwardly str8, if I saw another guy with a similar body I think I would also get aroused. I've posted this in another subreddit and some people consider this narcissistic. I guess that's true, but I don't think it's a bad thing. I think it's healthy to have a good opinion of your self.

I also see so many really hot women with amazing bodies, that I find it impossible to believe that they wouldn't get aroused by seeing themselves nude. Even an average body can be beautiful and turn yourself, and everyone else on.