Most of it came from my brother and my extremely patient and much more seasoned first girlfriend. She just let me explore and play and get comfortable. It was like a free form hippy classroom with orgasms. My mother is an idiot. The first time I got up the courage to ask her "Whats an orgasm" She red-faced responded that it was an exchange of fluids between two people during sex. (This was pre-YouPorn by like 10 or 15 years). I knew then I was been bullshitted but had no way to call her out on it so I just filed it away for later to be answered by my horny friends with access to VHS porn and my brother's more detailed explanations. I hope that if I ever had kids that I'd raise them in an environment where they could ask me whatever without fear and know that I'd give them an honest answer. But by the time puberty has made their junk usable, I'll assume that they would have been exposed to things that I just learned the names of.