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Is homosexuality genetic? It’s a long-running debate. This is an important question, because if this was proven (and accepted by lawyers and lawmakers), then discrimination against gays, such as state bans on gay marriage, would be ruled unconstitutional.

Now researchers say they’ve found a clue that may unlock the mystery. It lies in something called epi-genetics–how gene expression is regulated by temporary switches. They found that the transmission of sex-specific epi-marks may signal homosexuality.
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Gaydar is the ability to "sense" whether or not someone is gay. While it can be used to reinforce a person’s animosity towards homosexuals, it can also save someone time–it’s no use flirting with someone of the other sex who is only interested in people of the same sex.
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Scientists have long tried to figure out why some people are gay. Despite certain religious and political statements to the contrary, it’s well known that people are born with this predilection, and not only that–it’s a "spectrum," like autism, meaning that some people are "more gay" than others. It’s now been discovered that a chemical in the brain controls sexual preference in mice, and mice bred without serotonin (the "happiness" chemical) lose their preference for females. Could the same sort of thing be true for male homosexuals?
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