Good call--Amazon and pretty much every paying publisher whose submission guidelines I recall doesn't want any urine or scat.
There are probably niche kink markets--but then you'd need to add a bunch more similar material and figure out what those markets are.
Maryn, who's written a little for, ah, "specialty" markets
Have you read 'American Psycho'? That has some extremely graphic and very detailed torture/rape scenes. Somebody published that. They even made a movie, so...