I have always enjoyed jerking off with fellow masturbators. I started as a kid, with two friends, and in my teens, with three. Sometimes we would mutually masturbate each other, sometimes we would even play masturbation "games", like cum-shooting distance contests. It was fun and wonderful. Later, in college years and after that, I had several, regular JO buddies. Only a few now, in my late 40's.
In my 20's and 30's, I had many great experiences with mutual masturbation and circle-jerks. Most of them very fun and memorable. Especially the circle jerk that I took part in with 11 other men, in the forest above a nudist beach. All of just stroked our cocks, until we all shot our loads in the middle of out "circle". That was awesome!
But, most of my JO buddy experiences were with just one other guy, watching porn together.
In the last 15 years, it has mostly been cam-to-cam buddies, which is also fun. Masturbation is relaxing, good for the heart and mood. Sharing a wank session can also be educational. Always interesting to see other men's masturbation "techniques", and to compare our cocks. I also have had some great cam-to-cam sessions with fellow PE-ers, sharing our PE exercises.
In my opinion, it is a good "bonding" experience between open-minded men, whether or not they identify as bisexual, straight or gay !.