I had a few stoned sexual experiences too, solo and not. It was absolutely pornographic: imagine a skinny nerd doing one-handed push-ups for twenty minutes while in missionary position, just showing off, completely free of inhibitions and suddenly strong as an ox… Then the world exploded into bright white laughing shards, burning away all impurities and cleansing my soul.
On reflection though I realize that it was very selfish sex, completely about me. There was a completely mental orgasm once while stoned and playing music, but I don’t remember it much.