MPs are to consider banning porn web sites in the aftermath of the Jane Longhurst murder trial .

Brighton MP David Lepper is putting down an Early Day Motion in the Commons calling for a review of the law.

He is hoping to get support of MPs from all parties.

The motion is being jointly proposed with Martin Salter, MP for Reading where Jane's family live.

Mr Lepper said: "I have also written to the Home Office and I am meeting with ministers as soon as possible."

Graham Coutts visited rape, murder and strangulation web sites both before and after strangling Miss Longhurst, the 31-year-old teacher from Brighton.

Lewes Crown Court heard how they fuelled his sexual fantasies and contributed to Jane's death. Coutts, 35, from Hove, was jailed for life.

After the trial, Jane's family launched a campaign to rid the internet of the "monstrous" web sites.

Ray Wyre, one of the country's leading experts on sex offences, is backing the move and said Jane would be alive today had it not been for internet porn.

Mr Wyre, founder of the Centre for Investigations into Prevention and Study of Sex Crime Abuse in Milton Keynes, said web sites legitimised disturbed fantasists and some even offered users advice on escaping prosecution.

He said he was convinced there was a direct causal link between pornography and crime.

The campaign is being spearheaded by Jane's mother Liz, 72 and from Reading, and Jane's partner Malcolm Sentance, who lives in Brighton. They have been backed by Sussex Police.

Detective Chief Superintendent Graham Cox, head of CID, said porn sites were not the only concern. He said an internet link had been established in a suicide in Sussex.

Mr Cox said he would welcome research into the idea of destroying the sites electronically in ways similar to virus protection systems.

Peter Haydn-Smith, consultant forensic psychiatrist with East Sussex Health Care, said people like Coutts were very rare. Such acts represented sadistic control and while some people enjoyed these perversions, very few would go too far.

He said any site that showed violence was not desirable but he was unsure how they could be policed.