I was relatively old when I discovered it, maybe even 14. I'd had wet dreams, which I completely didn't understand, waking out of an erotic dream to find my self covered with this slippery sticky stuff. Late at night, I would wake up with a boner and I would stroke it because it felt good. Then one night, I came while I was stroking, and it was totally amazing. I recognized the sensation from the wet dreams and figured out after a day or so that the sensation was an orgasm. A few days later, I tried it again to see if i could bring it on deliberately and was delighted to find that I could.