When I was in college, I was at a party where everyone was pretty much shitfaced. A hot girl who was dating my friend had to pee, there was no where to go. She squatted down over a drain in the side lot and pissed while me and a few guys watched. She didn't even notice us. Watching her piss really turned me on. Since I've gotten to watch three other women piss but always when they were shit faced. It's been a long time since I've seen it and I'm guessing I'll never see it again but that's the outside the box thing that turns me on.