Yes, well, sado-masochists do, too. I know, a good friend of mie is (or at least comes very close to being) one.
I won't deny it: I was into the darker side of furry art for a while. It was something new and interesting, and it built up over my interest in the kitsune/foxgirl trend in Japan. It never got to the point where I'd want to **** animals, but I won't say an interest in the more graphic arts was never there.
That said, I have no problem with sexual deviance, so my viewpoint may be severely different from many people around here. You wanna be gay? Go for it. Into BDSM? Give it a shot, see if it suits you. As long as people aren't out there fornicating with animals, let 'em do what they want. It's better than seeing them vent sexual frustrations in destructive ways, like rape.
Now that I've said my piece, I think it's kind of obvious that I like foxgirls. Not anthro-foxes, I mean girls that have fox ears and a tail. It's so cute, how could you not love it?