Why do I have this fetish?

Alright, so I started looking at porn two years ago and started to get addicted to it. But that wasn't it, I also got hooked on "taboo" porn. For whatever reason it turned me on whereas I started to get desensitized to normal porn. I've been doing a lot better and haven't looked at porn in a while but today I looked at taboo porn again, and it's just like something's drawing me towards it. I don't know why I was watching taboo porn, the actual thought of sex with a relative disgusts me, yet why do I want to look at taboo porn. Is it because this addiction to porn has drove me to an extreme fetish?