I call the realistic ones Pip Slips. I won't turn down a good photo of a man with his cock out, but accidental pip slips are the ones that really get me hot. Like this.
PS. I remember this guy in my summer school art class who was extroverted, wacky. One day in the middle of class he just gets up and starts walking around with a clear boner. I think he wanted us to see that. Off topic, but it popped in my head at the momento.
