Strangely enough I think I was into sex even before I watched porn or began heavy usage. I made out with my cousins and sister in a "grownup" way around 9. I remember fondling the side of my mom's breasts when embracing her around 10 or maybe 11. I fantasized about sex with the girl from fast times at ridgemont high even when I still though women had male junk. When I started masturbation thing went into freaking overdrive. I would masturbate up to 10 times a day in middle school, even without porn, alot of times just fantasies or just trying to stimulate without visuals. It was then I became sexually attracted to my female cousins. At one time I snuck into my cousins room and smelled her underwear. My attraction to my cousins lasted until my late teens. And more horrific sexual desires lasted until 21 when I read some stories that completely shocked and traumatized me. I still get some flashbacks occasionally, and even some terror of finding those things turnons again.
While I completely admit to a pron/masturbation addiction, i think they issues have started long before. I read that childhood hypersexuality is a symptom of bipolar. Can it be a symptom of adhd as well? not sure.
Whew that was alot, just wanted to get this off my chest.