Since I've been into this since as soon as I could manage to wrap a belt around my wrist, I happen to believe this fetish is very much Nature. That is, genetic.
Now, I have kids. When my daughter was as young as 5, she was already "trapping" people in prison, cuffing her brother with fake cuffs (behind his back no less), tying her shoelaces together, and wrapping her hands into blankets.. Of course she's never seen me and my wife at it, nor seen it happen on TV.
So, yeah, I think it's very genetic, and transmittable, and maybe even a dominant trait.
Wait.. That means at least one of parents likes this too. Umm.. So, anyway.. Ignoring that.
Her brother likes to be pinned and tickled. And he's SUPER ticklish. SUPER. I fear for him!
Anyone have thoughts on nature vs. nurture here?