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So says a researcher who led a That amounts to an evolutionary paradox: Category Portal. These findings One possible explanation for why it is, they say, is that the same genetic factors also give a reproductive advantage to straight people who have them.

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Brendan Zietsch of the Queensland Institute of Medical Research proposes the alternative theory that men exhibiting female traits become more attractive to females and are thus more likely to mate, provided the genes involved do not drive them to complete rejection of heterosexuality.

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They described their intent to perform a genome-wide association study, a technique originally developed to locate genetic susceptibilities to diseases like macular degeneration and diabetes. Others will prefer activities that are typical of another gender. In a large study of more thanmen and women in the United States, United Kingdom and Sweden, researchers discovered four genetic variants that occur more often in people who indicated on questionnaires that they had had same-sex sexual partners. Findings from such large studies are more likely to be replicated than the small studies in the past, Bailey says.

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Now a team of researchers has carried out the largest-ever genetic study of sexual orientation and found evidence consistent with one possible explanation.

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