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Anthony Kuhn. Chinese lesbian couple Rui Cai left and Cleo Wu play with their twin babies, born last month. China does not allow same-sex marriages, and only married, heterosexual couples have access to assisted reproduction.

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We have a lot in common. The parallels of our homo-gay Canadian twin lives are uncanny. For starters, we both have a gay twin named Sara.

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Archives of Sexual Behavior. Twin pairs in which at least one twin is homosexual were solicited through announcements in the gay press and personal referrals from to the present. Thirty-eight pairs of monozygotic twins 34 male pairs and 4 female pairs were found to have a concordance rate of Twenty-three pairs of dizygotic twins were found to have a concordance rate of

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A proposed marker of prenatal androgen exposure is the ratio of the index finger to ring finger 2D:4D. Within each sex, this ratio may be lower for those who were exposed to higher levels of androgens and become attracted to women, as compared to those who were exposed to lower levels of androgens and become attracted to men. We examined these patterns in identical twins with discordant sexual orientations.

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THESE identical twins — one straight and the other one gay — could unlock the secrets about human sexuality. Rosie, left, and Sarah Nunn were studied by scientists investigating their sexuality. Researchers hoping to identify genetic and environmental factors associated with sexuality hit the jackpot when they discovered identical twins Sarah Nunn, who is attracted to men, and Rosie Albewhite, who is attracted to women.

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Sponsored link. There have been a number of studies of identical twins who were separated at -- or shortly after -- birth and raised apart from each other. These pairs of twins share identical DNA and yet grow up in totally different environments.

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Sexual orientation is more complicated than X and Y chromosome. Epigenetics has a greater role to play. People who are attracted to others of the same sex develop their orientation before they are born.

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