I must have been about ten, and at a school trip in the country. The rest of the boys and I, all about my age, were swimming at a public pool.
In the changing room some older boys and men came in and were walking around naked and showering and we were watching how big they all were. Later in the dorm we were talking about all the naked boys and one of the boys asked if any of us ever get hard. We all said yes and he said show and we all got naked.
He said his brother showed him if you pull it, stuff comes out so we all did, and for the first time ever I shot my load then. Not all the boys did, but the boy who asked me came the most. I wanked with him lots of times until I was 17 and then I went into the army, that's all everybody does there.