I remember the exact date. I was 11 and in the fifth grade. All the boys and girls in the class were separated, and a doctor came and gave each group a talk about puberty, sex, and other such topics. We were given a pamphlet that included information about changing bodies, sex, and masturbation.
After school, I went home and locked myself in my bedroom. Pulling down my pants and underwear, I began to inspect my pubic area. My penis seemed bigger than it had before, and soon it was erect and throbbing. To my surprise, I noticed a few wispy hairs around the base.
The pamphlet said that boys masturbate by rubbing the penis, especially the head. So I tried that, running roughly over the head with my thumb. Very uncomfortable. After a while, my erection subsided, and my parents got home from work anyway, so I quit.
Later that evening, in bed, I remembered my pubic hair, and I began stroking it under my underwear. My erection returned, and I put my hand around it. That felt amazing. I began stroking it and my testicles, and there was this amazing feeling building. Finally it became intense, my breathing quickened, and I felt fuzzy all over. Wow!
I went back to feeling my pubic hair, and realized there was something wet and sticky down there. Was it blood? In the dark I couldn't see, and I panicked. I quickly flipped on my lamp and find that no, it wasn't blood... Semen! I grabbed the pamphlet, flipped to that section, and read about it, and that calmed me down.
Well, once that happened, I was hooked. I masturbated every night from then on, to when I started having sexual activities with girls a few years later, and usually even then, too. When I was around 15 my usual habit was once on waking, once after school, and once to fall asleep.