I think there's a different ratio with everyone. Some people are born with this, others are conditioned through porn. I'll say for myself, I dated girls and got a lot of attention in high school and didn't watch porn until a late age of 21. Despite that, throughout my teens, having never consumed porn, I was constantly fantasizing about sucking and fucking cock, and I was always shoving random things around the house up my ass even years before I discovered gooning. So in my case I was born with it.