Here's some articles. Women are sleep around for different reasons then men are.
http://news.bbc.co.uk/2/hi/health/2369357.stm
Infidelity 'is in the genes'
Women and computer face
Different faces were chosen at different times of the cycle
Women with steady partners may still be tempted to sleep around - but mainly on certain days of the month, say researchers.
A BBC documentary to be broadcast on Wednesday explains how human sexual instincts are so strong that some women's preferences may alter significantly while they are ovulating.
While her partner might be a better bet to bring up children and support her, another man might carry genes which mean healthier, stronger children.
Serial cuckold
Morgan Wise, a train driver from Big Spring in Texas, found this out when his youngest son was found to have cystic fibrosis, a devastating lung disorder caused by a single faulty gene.
Morgan Wise
Morgan Wise found he had fathered none of his sons
Both mother and father must carry the gene to produce a cystic fibrosis child, and Morgan duly went for a gene test to confirm he was a carrier.
The test proved negative - effectively proving that he was not the child's father.
He told the BBC: "The doctor said: 'You are not a carrier of cystic fibrosis.' I couldn't believe it."
There was worse to come. Subsequent DNA tests revealed that not one of Morgan's three sons was fathered by him.
One in 10
However, researchers suggest that this is by no means an isolated event.
One study suggested that one in 10 children are being raised by men who are unaware that they are not the father.
Face
A more "masculine" face - better during fertile period
A study at the University of Stirling seems to pinpoint the instinct which might tempt some women to stray around the time of the month they are fertile.
Two groups of female volunteers were picked.
One was tested during their ovulation, the other at another point in her cycle.
Each was shown a computer image of a male face which they could adjust electronically to make appear more or less masculine, using features such as the thickness of the neck and the squareness of the jaw.
While the group not ovulating tended to prefer their men with slightly more feminine feature, at the point of ovulating, the women strongly preferred their men masculine.
This, say scientists, is down to instinct - while more feminine features might signify a man with less testosterone who is more likely to prove a steady partner, the stronger features they preferred at ovulation might indicate a better set of genes, producing a stronger or healthier child.
Human Instinct, presented by Professor Robert Winston, will be broadcast on BBC One on Wednesday at 2100GMT.
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Old 12-11-2006, 11:28 PM #19
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http://news.bbc.co.uk/2/hi/science/nature/179988.stm
Sci/Tech
Infidelity 'is natural'
Females 'stray to gather the best possible genes for their offspring'
Infidelity may be natural according to studies that show nine out of 10 mamals and birds that mate for life are unfaithful.
Experts found animals that fool around are only following the urges of biology.
New studies using genetic testing techniques show that even the most apparently devoted of partners often go in search of the sexual company of strangers.
Females stray to gather the best possible genes for their offspring, while males are driven to father as many and as often as possible.
"True monogamy actually is rare," said Stephen T Emlen, an expert on evolutionary behaviour at Cornell University.
According to him, there are two kinds of monogamy - social and genetic.
In the first kind partners bond and work together to raise their young. With "genetic monogamy," parents are faithful sex partners.
While social monogamy is relatively common, genetic monogamy is the exception rather than the rule.
Dr Emlen said there are only two monkeys, the marmoset and the tamarin, are truly monogamous.
All other primates, includes humans, often mate outside their partnerships.
"One of the patterns is that females seek males of high status and high quality," said Dr Emlen.
"By doing so, they are able to produce offspring of higher quality that will be able to do better and survive better."
Males are said to be biologically driven to stray by the desire to spread their genes into as many members of the next generation as possible.
But the reasons why people have sex outside a relationship are far more complex.
Researchers generally believe that monogamy originated among species whose young survived best when raised by a bonded pair.
This may have led to the rise of monogamy among people, since human children take so long to mature.
Birds of a feather
Faithful sex partnership has been thought for years to be widespread among birds.
The eastern bluebird was considered a prime example, with male and female partners working together to build nests, incubate eggs, then feed and raise their young.
But researchers have found that the bluebirds have a sex life that rivals a television soap opera.
Patricia Adair Gowarty, a behavioural ecologist at the University of Georgia, has found that 15% to 20% of chicks cared for by a pair of bluebirds were not fathered by the male.
She found that only 10% of 180 socially monogamous species are sexually faithful.
The research is published in the journal Science.
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