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Follow Natalie Wolchover on Twitter nattyover. The study found that identical twin sisters who share percent of their DNA are more likely to both be lesbians than are fraternal twin sisters who share just 50 percent , proving that, all other environmental factors being equal, genes matter. Their sexual fluidity may emerge from the fact that, across the board, women are sexually aroused by images of both men and women while men are typically only aroused by members of their preferred sex. This raises the question, why are there gay women? A study by Dutch psychologists published in the March issue of the Journal of Sexual Medicine reported that 10 to 12 percent of male and female children who feel discomfort with their gender go on to identify as gay or lesbian as adults. So, in terms of evolution, they would seem to have a better chance of passing on their genes, while at the same time it would seem that the genes that make women gay would quickly vanish from the gene pool. Therefore, the question "why are there gay women?

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Meanwhile, just 1 or 2 percent of children who are comfortable with their gender identity turn out to be gay or lesbian.

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Therefore, the question "why are there gay women? Their sexual fluidity may emerge from the fact that, across the board, women are sexually aroused by images of both men and women while men are typically only aroused by members of their preferred sex. Follow Natalie Wolchover on Twitter nattyover. Adding to the confusion about what causes lesbianism is the slipperiness of female sexuality itself.

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