I am a self-taught masturbator, as I had no siblings or friends where such behavior would be discussed or shared in more than a very cursory fashion.
In late 1972 I had just turned 14 and had only a very basic understanding of sex and how pregnancy occurred. I did not know it was possible to masturbate. Yes, I lived a sheltered life. Anyway, one December day I was sitting in Mrs. Adams' math class and was completely uninterested in what was being said, even though Mrs. Adams was hot.
One of the major babes in our middle school, Amy, sat one row to my right and one desk ahead. I had been horny I guess to some degree for quite sometime, but if I had wet dreams, I never realized it. Anyway, rather than listening to yet another math problem, i started fantasizing about Amy - my pre-masturbatory standard fantasy, a high volume forced enema. In this case, I remember I had imagined her tied up, spread eagle against a wall in the boys shower area under the gym. She was "connected" to a bag and the water was definitely flowing up that great ass of hers.
I don't remember how long I was fantasizing, but at some point I drew my legs closer together, simply intending to find a more comfortable position in my chair. At that moment I experienced an incredibly pleasurable sensation between my legs and up inside me, and not in my penis. I now know the movement stimulated my prostate and initiated an orgasm. I moved my legs apart again, and then back together and got a stronger sensation; I think the third time did it. And yes, I was in class, and I don't mean to insinuate I was flailing my legs wildly, but instead as nonchalantly as possible. I experienced a strong orgasm including my first ejaculation. I remember realizing that the liquid in my shorts was likely semen (I would have called it sperm), but how I knew that but didn't know about masturbating, I don't know.
After the orgasm was over, I didn't notice anyone looking at me or worse yet, the teacher staring at me, so I assume I masked my orgasm pretty well. A couple other things came to mind that now seem pretty silly, but hey, I was just a kid. First, when the ejaculatory spasms started, I remember thinking that my penis was actually moving in and out of my body like a piston in an engine cylinder. Of course it wasn't, but that's how I processed the feeling of those very first urethral spasms. Second, for quite some time I assumed I was the only one that knew masturbation was possible. I'd never heard of it, and stumbled on it completely by accident, so it seemed logical at the time. Of course once I got hold of some Playboys and Penthouses a couple years later, I learned everybody knew my damn secret.
I don't remember much else that happened that day, but I would assume I went to the restroom between classes to see just what I put in my underwear. Not surprisingly, when I got home I tried to duplicate my orgasm and was successful.
My father had been given a gag gift by co-workers after an illness - it was a Playboy jigsaw puzzle. Included in the puzzle was a copy of the Playmate of the Month centerfold to be used as a guide in assembling the puzzle. It was a very small photo of Miss May, 1970, Jennifer Liano and her fabulous tits. I wacked off many times to that little photo while learning the finer points of abusing myself. If you're out there somewhere Jennifer, thanks so much, and would you be up for an enema or two? Oh, and I understand Amy lives nearby - I've often thought it might be fun to thank her for "teaching" me to masturbate, but I'm not sure she would appreciate it. And I'm damn sure her husband wouldn't.
I had no idea at that time about the great things to cum.