Homosexual behavior due to genetics and environmental factors

Homosexual behaviour is largely shaped by genetics and random environmental factors, according to findings from the world's largest study of twins.

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<p><a href="http://www.physorg.com/news133928602.html">Homosexual behavior due to genetics and environmental factors</a></p> <p>Homosexual behaviour is largely shaped by genetics and random environmental factors, according to findings from the world's largest study of twins.</p>