It seems about 60% or more males will experience orgasm before 9, by their own hand. And fully 50% will attempt to put their penis in another boy's mouth before age 12 (though only 50% of THESE kids will repeat the activity). (Jim)
Of the 155 boys aged 13-17 examined by Dort, 84 had had experience with mutual masturbation: 8 had done it just once, 48 did it ocasssionally and 28 often.
Brongersma 1990, p. 392
Hass asked boys how enjoyable it was to have a girl touch their penises. By age 13, 23% of his subjects had experienced this, and by age 15, 49%. Of those experienced boys, only 2% had found it not enjoyable, 25% moderately enjoyable, and the remaining 73% very enjoyable.
Brongersma 1990, p. 388
Masters and Johnson observed in their laboratory a general difference in the abdomen's reactions between males in intercourse and males in masturbation. The pelvic thrusts necessary for intercourse could be substituted in masturbation by the semipastic contractile reactions of the abdominal musculature, apparent in drawing in of the belly.
Brongersma 1990, p. 391
Unfortunately I don't have such nice experiences to remember. I didn't even know how to masturbate until I was 14, and another 14-year-old initi- ated me into this. And I feel I missed something. (unknown)
>If it goes beyond that, I would strongly suspect that the children >involved have learned it from an adult (or from TV, etc.) I bet most people >here didn't have their first orgasm until at least age 10 or 11, unless >they were molested. I have had my first orgasm at the age < 8. I state here < 8 because memories were related with a house I have leaved at this age. I don't remember my first orgasm, in my memories I have always known about this possibility of my body. Nobody has shown it to me. Moreover, because my attempt to teach this possibility to another boy in my age was not successful, I have assumed some time that this is a special property of my body, and other people are not able to do this. I think, this shows with some evidence that I have not "forgotten" a molestation.