According to Dr Morgentaler, Viagra is triggering a male sexual revolution in a similar way the Pill did for women during the 60s. But far from liberating men from impotence, it is forcing them to confront previously hidden emotional problems in relationships - and many are opting to return to the physical frustration of the bedroom rather than face other issues. Dr Morgentaler, president of the Men's Health Forum in the US, says he has seen male patients who have decided to stop taking Viagra because it has increased their partner's expectations of them between the sheets. Others are taking Viagra - then leaving their partners after realising that while they may now be able to have sex, they are simply not attracted to their wives or girlfriends.