Joan Rivers enlisted Ray J's help to make a spoof of Kim Kardashian's sex tape, because it's not like he has anything better to do than to continue sucking the dust out of the corpse of the one thing that made him famous seven years ago. But even though it was that sex tape that made the Kardashians stars in the first place, TMZ thinks that all of them are still furious whenever people bring it up, and that's why Khloe Kardashian backed out on a guest host gig on Joan's show Fashion Police at the last second. Khloe must have only agreed to do it because it's an E! show, because Joan has always loved being a bitch to the Kardashians, so this isn't anything new. But she also probably agreed to do it because it's on TV, and these girls would hump a pack of donkeys in the center of Tijuana if it meant five more minutes of fame.