Thought this might be the best place to introduce this topic:
http://www.msnbc.msn.com/id/21309724/?GT1=10450
Quote:
CHICAGO - Julio and Mauricio Cabrera are gay brothers who are convinced their sexual orientation is as deeply rooted as their Mexican ancestry.
They are among 1,000 pairs of gay brothers taking part in the largest study to date seeking genes that may influence whether people are gay.
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GAY JEANS