When I entered 6th grade, I became friends with a kid a year older than me who had to repeat the grade. We did typical outdoor boy stuff and had fun. One day he asked me if I ever jerked off. I said no. He asked me if I wanted to see how it works. I said "Sure!" He unzipped his jeans and brought out his dick. He started to stroke it and I watched it get hard. It looked really big. He told me to try it, so I followed his lead. It felt really good and my own dick looked really big, too. When we came, it only oozed out; it didn't shoot. The more we practiced, the better it got. Eventually, we started to jerk each other. We had fun with it for 2 years and then went to different high schools.
I didn't think much about other guys' dicks until I was in my mid 20s. Then all hell broke loose!