I don't know. I mean I always liked elaborate torture stuff, hell I have memories of when I was in grade 3 and I forced myself to get naked in the middle of the night, go out into my backyard, climb a tree and scratch my balls on a branch a certain number of times because I "made a mistake" on my homework. I didn't even know what masturbation was at the time.
Things really escalated when I hit puberty, as weird as it sounds I was in my sexual prime around 12-13. I used to burn my crotch with hot water, force myself to drink my own urine, lick the toilet bowl, etc. Of course it's normal to be super horny when you're in puberty, but honestly my libido has dropped off a lot since then. I'm 25 and honestly nothing really turns me on that much anymore. When I masturbate these days its just okay but not great or anything. I think I first noticed my libido dropping at around 17 and it's just slowly gone down since then and now its bleh