Chuck Palahniuk: 'The only thing I shy away from is non-consensual violence. I can't write a story where someone is a simple victim because it's boring. Snuff goes into a grey area. She [the central porn star] is trying to set a world fornication record, by sleeping with hundreds of men. If it's done by choice, how it is different from trying to swim the Channel or climb Everest? The violence or tragedy somehow changes when it is permitted.'