I discovered it on my own at about 10. I was in a scouting lodge in a small room with several others, and an older guy had jokingly placed a fire bucket on his lap like it was his dick, it was about the size of a large coffee can, so we laughed, that was funny to us, but then he jerked it up and down a couple of times, and I wondered WTF. It passed my mind.
Then, when on vacation with my parents shortly thereafter, I had a separate adjoining bedroom in this lodge with my own bathroom, lots of potential fun in there, I started getting hard when I walked in and saw I had my own bathroom ... my dick was getting super hard as usual. I had learned to keep it straight up and fortunately my briefs were tight so it didn't bulge out too much.
I always had endless hardons. I had noticed the shower had some sort of a movable shower nozzle up and down, but it was too high to get my asshole onto it, otherwise, I would have given myself a good enema, I was disappointed a lot about that, so I stuck my finger up my asshole a number of times, that satisfied me for awhile. I had no concept of masturbation, just that I really liked a really good enema (started at about 5) and I had a private bathroom in that lodge. I was so disappointed I couldn't do a good enema in that bathroom. Even today I'm disappointed about that, it would have been a good one! Oh, I was so horny for one.
So, I got into bed that night with a super huge hardon. I liked hardons, but had no concept of cuming, literally had no idea about cuming. I was always more interested in my asshole, what I could stick up it and my favorite, enemas on my own, big ones! LOL, I was really naive, I used to wonder what good a hardon was. I knew nothing about sex.
So, somehow I brushed against my really hard dick, hmmm, that seemed interesting, felt sort of good. Then I thought about the guy and his fire bucket he was rubbing like it was his dick. So, I said to myself, let's rub it some more, wow, that felt good. As a natural, I guess, I wrapped my hand around my dick and shook it some more, I started wiggling in the bed, I was really getting excited, all new feelings, I kept at it, suddenly I felt I was going crazy, all of the feelings welling up in me, all of the intensity, and I let loose with a whole lot of tremendous pulsations, it was incredible and I thought, I had better never do that again, whatever I did, because it felt like I was losing my mind!
My mother called in from the other room, they were in bed asleep, and said something like are you OK, what are you doing. I said, oh, I was just getting comfortable. Ha, I guess I was making a lot of noise with my first jerk off session! She said no more.
I had no idea then about cum, I had no idea anything had shot out of my dick. My parents never talked about sex, neither did my friends. The maid the next morning must have seen a really huge spew of cum all over the sheets. It had to be a whole bunch of cum, it seemed the pulsations had gone on a very very long time. We were gone the next morning, only there that night, so my parents did not get hit with an additional charge for cum cleanup! LOL! Was that ever fun! Then, I started combining my enemas with jerking off, that took me to new heights of intense excitement. I had a very hot time in my youth as I still do.