I have a scat fetish
I like feces in a sexual manner. It turns me on like nothing else. I get my girlfriend to take a dump on my chest before sex, and it turns me on like nothing else.
It is the most amazing thing, and I jerk off to the thought of excrement on a daily basis. For me, good sex starts with getting shat upon. And without that, I just don't get into it like I normally would.