As a kid, I always had a diverse group of friends. I played sports and hung out with a lot of jocks, but I was also a good student and had another group of more intellectual, and less athletic boys. From about the sixth through eighth grade, I would sometimes be with one of the more bookish friends in one of our homes after school and would get into a "show me yours and I will show you mine" situation. Typically, it was just looking with no touching. We were all Caucasian kids from fairly affluent families born in the early '70s in the Southeast U.S. Everyone was circumcised and it was fascinating to me to see how different each guy's genitals looked as well as to see how much pubertal development he had had. In the sixth grade, a boy moved to our school district from the Northeast who was unathletic and somewhat effeminate. I became friends with him and the first time we hung out after school, he asked to see my penis. I agreed if he would follow suit and let me see his. I went first and took my pants and briefs down. He did not just look, he wanted to touch my penis and balls. I was 12 years old with Tanner III development. In other words, I had an adult sized penis, hanging balls and a decent pubic bush at the base of the shaft. He played with the penis and it got erect immediately. He handled the balls and then he started stroking the erect penis. I stopped him until he showed his. He, reluctantly, dropped his pants and briefs and took out the first uncircumcised penis I had ever seen. I handled it and retracted his foreskin to reveal a shiny purple head with a good deal of smegma on it. (Now I understood what was removed with a circumcision as I had a very poor understanding of what the process of "circumcision" was all about.) After I checked him out, I let him give me a hand job to completion.
From that day forward, I would regularly go to his house after school for him to beat me off. It became understood between the two of us that he would examine my penis and testicles and give me a hand job if I came over to his house or if he came to my house. It was only necessary for one of us to ask "can you come over today?" or I might ask him "can you do it today?" Unfortunately, his family moved away after a year or so.