“It is not fair that everybody knows about Viagra, Levitra worked perfectly for me and moreover it is less expensive and easier to find. I almost have not experienced any side effects, at least those severe to make sex impossible. Works like a charm.”

“I was shy to share with my doctor about decrease of sexual activity which I occurred for the last couple of years. He advised me Viagra which could realize my sexual drive and fantasies. A feel alive again! Viagra saved me!”

The case, which opened in the High Court on Wednesday, originally involved 3,000 claimants and is set to become the largest product liability case in UK history.

Current rules state that three unsuccessful pregnancies are needed to trigger NHS support - but a pilot project could bring about change.

Researchers stress that simple lifestyle changes can still significantly reduce the risk of cancer.

Poor housing, obesity and the effects of deprivation have been suggested as underlying cause.