Some other honorable mentions:

1. That fetish where you step on and squish and kill little animals. Bugs. Mice. Birds. Or get off on seeing girls with hose and high heels do it.
2. Getting kicked/punched in the nuts.
3. Necrophilia.
4. Scat (I once had a guy on Gay.com offer me money to go dookie in his mouth. He said he had a special chair set up for it and would pay me $20 per mouthful. I told him that kind of performance-based payment system was unacceptable, as he could "shave" results... maybe he had a big, huge mouth. Maybe he could let it fill up his mouth way too much before swallowing (the swallow would designate the amount as having been a "mouthful")... like letting it fill and then overflow like Dairy Queen soft serve ice cream and screw me outta money. That and the fact that I damn near vomited just reading that message from him. It was a few months before I dared go to gay.com again.
5. http://www.balloon-guys.com
6. http://www.boyknights.com
7. Punch Fisting.
8. Sticking objects up in to the urethra (pee hole).
9. Animals up the booty (snakes, ferrets, mice, rats, fish, eels, lizards)
10. Preggo-fetish (pregnant women. It's not that I think pregnant women are unnattractive... it's just... why would someone have a fetish for em?!).
11. Diapers.

I'll think of more as I emerge from therapy.