Extreme pornography is apparently defined as the following
Quote:
An act threatening a person's life
An act which results (or is likely to result) in serious injury to a person's anus, breasts or genitals
An act which involves (or appears to involve) sexual interference with a human corpse
A person performing (or appearing to perform) an act of intercourse (or oral sex) with an animal (whether dead or alive)
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Those are all pretty understandable I'd say