I love understall sex
When I was traveling a lot for work I'd often be at the main airport men's room on Sunday evenings, and in one spot there was a lot of understall play. Once a guy squatted beside the stall wall so I could stroke his cock and play with his balls. I started touching his hole with my thumb, and he sat on it and fucked himself with it until he shot his load. It was unexpected, more than a little strange, but pretty hot.
I agree that understall is extremely hot! When i was in high school, college and even after college I did a lot of understall in cruisy restrooms. I still remember the thrill of seeing a guys hairy legs and hard cock slide under the metal wall. When i was younger I would usually either jack or suck the other guy. The first time i watched another guy squat on a raw cock and ride it I blew a huge load just watching. After that I would lower my ass on that hard cock and ride it until I received his seed. I preferred totally anon, didnt want to see the face or age of the guy! The good ole days!!