Suddenly spammers face a problem. Their potential market has been cut in half. The killer quote from chick author Kathy Lette:

"It's just a question of when men will cotton on. To please a woman in bed, all a man has to do is a poetry course. They also have to learn that the Kama Sutra is not an Indian takeaway and that the mutual orgasm is not an insurance company."

Pfizer nevertheless insisted that the search would go on for a female Viagra. "Pfizer has made a number of major contributions to the emerging science of female sexuality," says Feczko. "We now have a better understanding of the biochemical and physiological factors involved in female sexual function."

Lette advised Pfizer not to bother: "A cheap and widely available tablet to restore the female sex drive already exists. It's called paracetamol."