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A malodorous gas behind the smell of rotting eggs has been found to play a key role in giving men erections. Scientists believe the discovery could lead to the development of a male impotence drug to rival Viagra.

The whiff of hydrogen sulphide accompanies the biological degradation of sulphur-containing substances. It also belches from the exhausts of cars fitted with catalytic converters.

A study has shown that, prior to sexual intercourse, minute quantities of hydrogen sulphide are released within the key nerve cells of the penis which control the engorgement of the male organ with blood to stiffen it. Scientists believe that the discovery could lead to the development of a new class of drugs to combat erectile dysfunction by affecting a different biochemical pathway to the one targeted by Viagra.

The research was based on experiments performed on the intact erectile tissue of eight men who had undergone sex-change surgery in a hospital in Italy.

"We found that hydrogen sulphide is involved in human penile erection. That was proved in this study," said Professor Giuseppe Cirino, of the University of Naples Federico II.

About one third of men with erectile dysfunction do not respond to Viagra, and it is those men that Professor Cirino said may benefit from the development of a drug targeted at hydrogen sulphide rather than nitric oxide.

Dr Peter Lovatt, a psychologist at Hertfordshire University (UK), has been studying which dance styles are most (and least) attractive to the opposite sex. See his hilarious video demo.

A person's attitude to sex might be written all over their face, according to a study of attractiveness.

A computer generated image of the face on the right which is of someone who is more likely to be interested in a short-term sexual relationship whilst the one on the left is more likely to be interested in a long-term relationship.

"What was interesting was the strength of the preference among men for women who were interested in short-term sex and the strength of the preference of the women for men not interested in short-term sex," said Lynda Boothroyd of Durham University, who led the study.

Researchers surveyed 700 men and women in their early 20s, who were asked to look at photographs of the opposite sex and judge how attractive they were and what their attitudes to sex might be - such as whether they were interested in long or short-term relationships. The answers were compared with the real-life behaviour and attitudes of the people in the images.

The results showed that men and women could generally judge who would be more interested in a short-term fling just by looking at their expression and features. In one study of 153 participants, 72% of people correctly identified the attitudes from photographs more than half of the time. "Men who said they were interested in short-term sex were seen as looking more masculine," said Boothroyd.

Emmanuele Jannini, of the University of L’Aquila, claims to have found the first anatomical evidence for the existence of the G-spot, the elusive and controversial pleasure point, which some women say triggers powerful vaginal orgasms. His research could also explain why so many women have searched for their G-spot in vain: it suggests that not all of them have one.

The G-spot is named after Ernst Gräfenberg, a German gynaecologist who in 1950 proposed that a sensitive point on the vaginal wall could provoke particularly intense orgasms in some women, which differ from normal orgasms caused by clitoral stimulation. Finding it has since become a staple of good-sex handbooks.

Its existence, however, has been widely questioned. Many women have always found it impossible to locate, leading them to doubt their own sexual skills or that of their partners, or to wonder whether the whole idea of a vaginal pleasure point is a myth.

Dr Jannini has found anatomical differences between women who can have vaginal orgasms and those who cannot and told New Scientist that it may be possible to develop an ultrasound test that can tell women whether they have one.

He used ultrasound to examine nine women who said that they could have vaginal orgasms and eleven who said that they could not. He found that the tissue between the vagina and urethra was thicker in the first group, which could be linked to their ability to have an orgasm.

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