To: Box-By-The-Riviera™ who wrote (298472 ) 11/26/2004 10:33:51 AM From: Pogeu Mahone Respond to of 436258 New excuse for love rats Fay Burstin 27nov04 SCIENCE could soon vindicate disgraced unfaithful wives such as Meg Ryan, Paula Yates and Camilla Parker-Bowles. British researchers have found that although more than one in five women has cheated on a long-term partner and 90 per cent have thought about it, it could all be a matter of genetics. Professor Tim Spector, of St Thomas' Hospital, London, said some women had a set of "infidelity genes" which make them twice as likely to be unfaithful as others. The findings follow a study of female twins, which showed cheating was largely genetic and likely to run in families. The genetic influence on infidelity accounted for about 40 per cent of the overall likelihood of a woman being unfaithful, with the rest due to environmental factors, he said. "But I do believe we would have similar findings in men," he said. Prof Spector studied 1600 pairs of female twins, some identical sharing all their genes and some non-identical, sharing about half their genes. Questionnaires about the twins' love lives revealed 22 per cent admitted cheating on their long-term partners or husbands at some point. But this figure doubled to about 44 per cent among women with an identical twin sister who also had been unfaithful. The study, the first of its kind to look at the influence of genes on fidelity, found women who had been unfaithful had twice as many sexual partners as the average woman their age. Although infidelity genes have yet to be identified, Prof Spector said this could soon be possible, raising the prospect of would-be spouses asking their partner to be tested to see whether they were likely to stray before committing to marriage. The study could help explain how Paula Yates' infidelity mirrored that of her parents. The British breakfast TV presenter had an affair with Australian INXS frontman Michael Hutchence in 1995 while married to rock star Bob Geldof. Later, she discovered she was not the daughter of TV host Jess Yates as thought, but the offspring of an affair her mother had with his rival Hughie Green. But psychologist Glen Hosking, from Melbourne's Cairnmillar Institute, said a genetic influence over infidelity was possible, but it was much more likely to be an interaction between genes and environment. "It's the classic nature versus nurture debate -- children who are exposed to parents having affairs are more likely to be unfaithful themselves because that's their idea of normality," Dr Hosking said. "But children of parents in a stable, loving relationship learn from that example."