My first sex was with another guy. I was 13 and had matured early. He was 12 and had a dick the size of my little finger. So it was mainly him pleasuring me. That was my first orgasm. I gushed cum all over the place; we were both startled and intrigued. I think he felt inadequate after that because we never again did enough to make me cum. So I started masturbating, and I'm still doing it, in lieu of anything else, all these years later.