Yes, I jacked off with three different friends when I was younger. My first was a guy who used to sleep over back in the day. He was a couple of years older than me and showed me how to jack off. God, it was fun seeing his dick and balls. He had very dark skin on his balls...I remember noticing that. Then having learned it from him, I did it with a neighbor. I had a pretty big dick, but my neighbor was hung like a horse. I got a thrill out of seeing that thing. He was funny because he was very conservative, so as soon as he cummed, he always ran to the bathroom to wash his hands immediately, like it was all too dirty for him. We never talked about it after, because it was something we did very private. Another friend of mine had a shed in his back yard with his brothers playboys hidden in there. So we would look at them, get horny, and then take our pants down and show each other our dicks. Mine was much bigger than his and this seemed to interest him. Also, I had much more hair on my dick and he used to say things like "I wish I had more hair." All three of these guys were straight and I was the bi one. So maybe it wouldn't have happened if I hadn't been a bit bi. I wanted to see some dick so I was always game!
this was my experience as well