I started masturbating purposefully when I was mine. I had dry orgasms until I was 13. Then I got a lot more efficient, and could bring my penis to such a point of excitement that it felt like it had a life of its own.
I started ejaculating when I was 13, and was so fascinated by seeing come shooting out of my pecker, that a jacking session became a ritual. I always started by removing all of my clothes, lubing up with vaseline, jacking for five minutes or so then stopping to admire my now red very hard pecker. It would bounce up and down by itself as I stared entranced at it. After a minute or so of staring, I'd start again, and jack until I felt the first twinges of an orgasm and stop again. By then my pecker head was like a mushroom, my balls were retracted so my sac looked empty. Then I'd start again, and keep going until I was past the point of no return when my pecker seemed to have a life of its own that I could not control if I had wanted to. If I hadn't jacked off for several days (unlikely), I could shoot a load as high as my head when I was lying down.