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  gay men and lesbian women may simply be the two ends of the same distribution. What about women who are gay? Are there lesbian genes? Our biological understanding of homosexuality in women lags behind.   this new research, he said provides even more evidence that being gay or lesbian is a natural part of human life, a conclusion that has been drawn.   estimates as to the number of gay people in the population range from 1-in-20 to 1-in-10, so why are some people gay? Are they gay by choice or is being gay genetic? The simplest answer is to look at the definition of the word gay. Other research has found that being gay or lesbian tends to run in families. Its also more likely for two identical twins, who share all of their genes, to both be gay than it is for two. 28, 2005 - the genes a man gets from his mother and father may play an important role in determining whether he is gay or not, according to a new study likely to reignite the gay gene debate. 12 levay has recently completed a second book in collaboration with elisabeth nonas--city of friends--that surveys gay and lesbian culture it will be published by mit press in november. The relationship between biology and sexual orientation is a subject of research. While scientists do not know the exact cause of sexual orientation, they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences. Hypotheses for the impact of the post-natal social environment on sexual orientation, however, are weak, especially for males.   scientists have studied twins to try and learn if being gay is biologically determined. Studies of identical and fraternal twins suggest that there is a genetic influence on sexual orientation. An analysis of 40 pairs of gay brothers and found that they shared 82 of their alleles in the xq28 region, which was much greater than the 50 allele sharing that would be expected by chance. 25 however, a follow-up study by the same research group, using 32 pairs of gay brothers and found only 67 allele sharing, which was much closer to the.

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