Last month, the UK passed the Criminal Justice and Immigration Act, which, among other things, makes it a criminal violation to possess extreme photographic images. These images don't have to involve children at all; they merely have to depict an image produced solely for the purpose of sexual arousal that someone believes "is grossly offensive, disgusting or otherwise of an obscene character," and falls within section 7 (below).

(7) An image falls within this subsection if it portrays, in an explicit and realistic way, any of the following— (a) an act which threatens a person’s life, (b) an act which results, or is likely to result, in serious injury to a person’s anus, breasts or genitals, (c) an act which involves sexual interference with a human corpse, or (d) a person performing an act of intercourse or oral sex with an animal (whether dead or alive), and a reasonable person looking at the image would think that any such person or animal was real.

-- JoshS - 05 Sep 2008