Some people are naturally graceful on the dance floor, while others seem burdened by two inept left feet. Blame it on the Ice Age.

According to new research, the ability to dance may have been a factor in survival for our prehistoric ancestors, who used their moves to bond and communicate with each other when times were tough.

A study published in a recent issue of the Public Library of Science's genetics journal, suggests that, as a result, today's creative dancers actually share two specific genes. Both genes are associated with a predisposition for being good social communicators.

Scientists believe this gave early humans who were well coordinated and rhythmic a distinct evolutionary advantage.

Dancing genes

"Dance, like music, is an activity dating to prehistoric times that is sometimes a sacred ritual, sometimes a form of communication, and sometimes an important social and courtship activity," wrote the researchers, who were psychologists based primarily out of universities in Jerusalem. "We hypothesized that there are differences among individuals in aptitude, propensity, and need for dancing that may partially be based on differences in common [genes]."
DNA was obtained from 85 elite dancers and their parents to compare with a group of people lacking any distinguishing characteristics, as well as a group of athletes.

The genes studied don't control a specific physical ability, but they dictate two well-known social and behavioral chemicals in the body: serotonin and vasopressin.

As researchers suspected, both chemicals were found in much larger quantities among the dancers. In other words, while the elite dancers couldn't be put in a different physical category from everyone else, they all shared genes that made them more social.

The survival dance

This innate ability was crucial in prehistoric times, according to Steven J. Mithen, and archaeologist at the University of Reading in England.

"Cooperation would have been essential for survival during the last Ice Age and this would have been facilitated by the social bonds that develop through communal dancing and singing," Mithen told LiveScience.

In his new book "The Singing Neanderthals: The Origins of Music, Language, Mind, and Body" (Harvard University Press, 2006), Mithen contends that because of their communication powers, dance and music likely became an important tool of social interaction as soon as humans could walk and talk.

"It has been argued that the specific nature of human anatomy suggests that it evolved for endurance running as much as walking. As such it could have also been used for dancing, as bipedalism requires high degrees of muscle control, balance and flexibility," he said.

Dance like a Neanderthal

Mithen's research focuses on the Neanderthals — our prehistoric cousins — as opposed to Homo sapiens' direct ancestors. But he believes the importance of dance was widespread and probably practiced by early humans, too, as far back as 1.5 million years ago.

And, as it is on modern dance floors, their prehistoric moves had a lot to do with hooking up.

"In many societies today, dancing is used as a form of display for attracting mate," Mithen points out. "Dancing is a means to show off one's physical fitness and co-ordination, qualities that would have been useful for survival in prehistoric hunter-gatherer societies."

Height : 5'7" (1.74 m)
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Dana Vespoli (born on 22 September 1972 in the San Francisco Bay Area, California) is an American pornographic actress.
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Men in their 50s have more satisfying sex lives than men in their 30s, a survey suggests.

A team from Norway and the US surveyed 1,185 men aged between 20 and 79, and found more problems with impotence and declining sex drive in older men.

But despite this, men in their 50s reported similar levels of satisfaction with their sex lives as those in their 20s.

Details are published in the urology journal BJU International
The men, who responded to a postal questionnaire, were asked to rate their satisfaction with various aspects of their sex life on a scale of zero to four, with four representing good sexual function and no problems.

Men in their 20s recorded an average overall satisfaction level of 2.79, while the second highest level was among those in their 50s, who recorded an average of 2.77.

Men in their 30s only reached 2.55, and men in their 40s averaged 2.72.

After the age of 59, overall satisfaction fell significantly to 2.46 for men in their 60s and to 2.14 for men in their 70s.

However, when it came to sexual function, each of the scores moved steadily downwards toward zero as the respondents got older, indicating lower levels of function and more problems.

* The average score for satisfaction with sexual drive was 2.19 out of four, ranging from 2.79 for men in their 20s to 1.54 for men in their 70s

* Satisfaction with erections averaged 2.83, falling sharply once men reached their 50s; men in their 20s scored 3.63, men in their 50s 3.03 and men in their 70s 1.6

* Satisfaction with ejaculation averaged 3.28 and showed a more measured decline with age, falling more sharply for men in their 60s and 70s. Men in their 20s averaged 3.85 while men in their 70s averaged 2.32

'Less hung up'

Researcher Professor Sophie Fossa, from the Rikshospitalet-Radiumhospitalet Trust in Oslo, said: "The results showed a very strong correlation between men getting older and reduced sexual functioning, but not between age and sexual satisfaction.

"Age accounted for a 22% variance in sexual drive, a 33% variance in erection issues and a 23% variance in ejaculation issues.

"But age only accounted for a variance of 3% in overall satisfaction.

"Our results show that, although men experience more problems and less sexual function as they get older, it doesn't necessarily follow that they are less satisfied with their sex lives as a result."

Ronald Bracey, a psychologist with a special interest in male sexuality, told the BBC News website he was not surprised by the results.

"Men in their 30s and 40s are often too stressed by things such as being successful in their career to enjoy sex.

"But by the time men get into their 50s, they have usually adjusted to what they want out of life, and tend to be less hung up, less concerned by what other people think of them, and less prone to performance anxiety."

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