A few years back on a business trip to the US west coast, I went in search of an adult book store I read about on the WWW. This one had all kinds of videos, magazines, and toys; more magazines than I have seen. It also had a video arcade. There was nothing too exciting there, so I left. This was in an area which had a few adult establishments, so I drove around to see what I could find.
I went into another place. Standard fare as above until I went into the video arcade area. Much to my surprise there were booths with no doors on them! There was a sign outside each booth that said that customers were not guaranteed privacy or something like that. The entrance to the booth was open to the main aisle and there were 6-8 booths on each side. If you stood at the entrance to a booth you could see about half the screen. There was a small alcove to the left with a chair. In a nutshell, if you put money in, anyone outside could see and hear what you were watching and with two steps forward could see what you were doing. I decided to put a couple dollars in to view a few movies.
Knowing that many guys come in to jackoff and feeling adventurous, I decided to go for it aware that I could easily be seen. As I was getting into stroking, a guy walked into the booth, took a short look, but then left. I cycled through a few different videos, but feeling daring (for me) I left the screen showing a scene with a guy sucking another one's dick. I actually was not watching the action on the screen much but was focused on the thrill of possibly being caught jerking off with the male-male action on the screen. The rush of anticipation of someone walking in pushed me over the edge and I proceeded to shoot a nice load.
I was up early the next morning and went back to this place intent on two things: I wanted to see a guy stroking his dick and also shoot my load as a guy walked in my booth. As luck would have it, the place was closed until 7:30am, and I had places to go, so this had to wait for a future trip. Since this experience, I have had the chance to jerkoff while another guy watched but have yet to fulfill my fantasy to watch another guy cum.