Oh... You're one of THOSE people... The fuck is it about literal shit that turns you on?
...Ah yes, asking someone to shit on your chest? Completely normal.
I'll agree on age play, though. I mean, if I'm fucking someone, I don't want them acting like a baby (and anyone who does should have their hard-drives checked).
Gore... Not my thing, but not as bad as the other 2 (I find it funny how you say "or god forbid a gore one" as if that's worse than age play).
"optional" fetishes... Clue was in comment. And yes I am one of those dirty guys that if I fuck the shit out of a Girls ass and they cum so hard they literally squirt out there pussy and ass I find that pretty hot. To each there own some guys like feet ffs... FEET!! like who looks at a manky toes and gets a semi. Gross.