I was only 15 at the time and this place was a medium size regular theater showing adult films exclusively and during those days, they could care less about who was coming in just so they can sell tickets.
The first time, my cock was pulsing in my pants and I really wanted to jack off but was so scared. I did see other guys jacking off and rubbing themselves on top of their shorts, so I did that too. Then an old guy sat down next to me and outright pulled my hand and tried to put it on his lap, but I yanked it away really quickly. I left but thought about it later what it would have felt like.