The wheels on the bus go round and round and the pants on the bus go down so dudes can get their kicks. What is it with guys wanting to jack off in public and on the bus? I would assume part of it has to do with the thrill of getting caught that and guys will usually jerk their dicks wherever they can get away with it.
Personally I try to wait til I get in the house. I don't mind sneaking and having sex in public but the solo doesn't seem all that fun. Plus who wants to get busted by themselves?
This guy looks like he's having a great time tho.