To some people it is exactly the kind of protective legislation that Britain needs in a world where access to a vast array of pornography is available at the click of a mouse. To others, a new law banning "extreme" pornography gives the Government unprecedented powers to police bedrooms (and basements).

Critics, including at least two lords, say that legislation coming into force next month forbidding the possession of "an extreme pornographic image" will criminalise thousands of previously law-abiding people who have a harmless taste for unconventional sex.

Section 63 of the Criminal Justice and Immigration Act 2008 comes into force on 26 January and makes owning offending pictures a criminal offence punishable by up to three years' imprisonment. An image is deemed to be extreme if it "is grossly offensive, disgusting or otherwise of an obscene character" and portrays in any way an act which threatens a person's life, or which results or appears likely to result in serious injury to someone's genitals or breasts.

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