ForgottenPr0digy said:
Urine
Scat
Vore/Gore
BDSM
S&M
Overweight
Inflation
Anal fisting
beastality
necrophilia
From what I've seen, a fetish is usually an overblown aspect of what is normal, like power play (okay, relatively normal). Vore comes from being inside another being with more than just fingers, genitalia or tongue, and even becoming part of them if you go further down the line. BDSM is again powerplay, taken to a next level. same as s&m. some people just like pain. it makes adrenaline shoot through the veins, and that gives a kick I suppose.
Fluids/solids is basically done to be disgusting it just turns some people on.
Overweight is just a preference.
Why does everyone have to be skinny and flat? In some countries being fat is a luxury, and a show of wealth. Also Big bottoms and breasts do tickle a lot of people's fancy. Inflation I cannot really explain, but I suppose it's again from liking other body types than flat. Anal fisting is basically the same as fisting and anal combined. People do that if they want spice, and I've read it's incredibly arousing or something.
It all comes down to personal interest and personal preferment. And by saying that it's wrong disgusting or evil you deny some people a part of themselves. and now you know

Of course some of these things (Necro, Gore and Beast) should not be practiced because they really are quite wrong. which sounds somewhat hypocritical of me, but I'm really against them.
Do note: I have not practiced any of these things. Or anything beyond kissing and boobtouching really. This all comes from spending way too much time on the internet trying to understand that what I really shouldn't have seen anyway. Oh well.