Twins help in sexual orientation study

Researchers at Northwestern University in Evanston, Ill., are working on theories that nature and not nurture is the determining factor in sexual orientation.

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<p><a href="http://www.physorg.com/news75986608.html">Twins help in sexual orientation study</a></p> <p>Researchers at Northwestern University in Evanston, Ill., are working on theories that nature and not nurture is the determining factor in sexual orientation. </p>