'I shall rape your corpse!"
that's a quote from the game?!
There's some Dremora dude in one of those towns with the crab shell buildings. When you go in the basement you can talk to him and he threatens you with corpse rape. It might be Gnisis or Ald'ruhn
Edit: it's been a few years, and I tried to find it just now but I don't have it installed at the moment, so I don't know where exactly but it does exist. A quick google search came up with a page that says you can talk to one, but no location. I have to go to class now, but if anyone wants to help out that would be great.