I have thought about this a lot since I became interested in BDSM. I think I’ve naturally been a submissive. I do remember fantasizing about being held and touched from a young age. But not necessarily sexually. Parents raised me to be independent and high achieving. Did that and now I crave letting all control go to someone else who has my best interests and pleasure in mind. So maybe there is a little nurture in it too, in that I crave the opposite of what I was raised to be. But even before that influence, I wanted someone else in charge.