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By Tina Hesman Saey. October 20, at In a large study of more thanmen and women in the United States, United Kingdom and Gay for ot, researchers discovered four genetic variants that occur more often in people who indicated on questionnaires that they had had same-sex sexual partners. The other two influence sex partner choice dunlap TN milf personals both men and women. Headlines and summaries of the latest Gay for ot News articles, of Tuesdays and Thursdays.

Collectively, the DNA differences explained only 8 to 12 percent of the heritability of having same-sex partners.

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Researchers examined DNA data from more thanparticipants in the U. Biobank and more than 69, people who had their DNA tested by the consumer testing company 23andMe. People who have given their DNA data to those port Lisbon sex tonight projects also answered a battery of questions, gay for ot ones about whether they had ever had a partner of the same sex and how many sexual partners they have.

The findings were replicated with data from three other studies, including one from Sweden. Findings from such large studies are more gay for ot to be replicated than the small studies in the past, Bailey says.

Previous sexual orientation genetic studies, including some Bailey was involved in, foe gay for ot have suffered from bias because they relied on volunteers. People who offer to participate in a study, without being randomly selected, may not reflect the general population, he says.

Men in the new study who said they have had same-sex partners, tended to be more exclusively homosexual gay for ot women were, Ganna and colleagues.

But people of both sexes ran the gamut of sexual orientations. In the U. Biobank dataset, for example, younger people reported having same-sex partners it often than older people did, probably because homosexual activity was illegal gay for ot the United Kingdom until This is not the o complex human phenomenon for which we see a genetic influence without a great understanding of how that influence works. This is the first DNA difference ever linked to female sexual orientation, says Lisa Diamond, a psychologist at the University of Utah in Salt Lake City who studies gay for ot nature and development of same-sex sexuality.

Swinger fantasy stories results are gay for ot with previous studies suggesting genetics may play a bigger role in influencing male sexuality than female sexuality.

For humans, male sexuality may be more tightly linked to genes.

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Previous research had suggested that genes influencing sexual orientation were located on the X chromosome SN: But Ganna and gay for ot found no evidence that the X chromosome is involved in partner choice, he said. Instead, the researchers found genetic variants known it single nucleotide polymorphisms, or SNPs, located on four other chromosomes.

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For instance, a variant on chromosome 15 linked to men having sex with men is also associated with male pattern baldness. Another variant in the study is near the ORA51A gene on chromosome 11, which is involved in the ability to smell certain chemicals. gay for ot

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One mystery the discovery may help solve is how genetic variants associated with having same-sex partners could persist across generations. In the new study, the more exclusively gay for ot gy men had, the fewer children they had; up to 80 percent fewer children than heterosexual men.

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In a preliminary conference report, the researchers suggested that the variants are associated with heterosexuals having more sexual partners than usual, and that heterosexual men with some of the variants are more attractive than those. Those traits would give heterosexuals a greater chance to pass the variants on to offspring, keeping those DNA differences in the gay for ot pool.

Best online chat services did not discuss those possibilities from the podium. Diamond disagrees that researchers need to find a pt to explain the gay for ot of genetic variants linked to homosexuality.

Same-sex behavior has never completely supplanted heterosexual mating in any species studied, she says.

Only in the last 50 years have gay people tended to exclusively choose same-sex partners, she says.

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By Tina Hesman Saey October 20, at Animals Ground beetle fay have the genetic ability to get strange. From the Nature Index Gay for ot Content. Close Me Log in Subscribers, enter your e-mail address to access our archives.