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We have known for decades that sexual orientation is partly heritable in men, thanks to studies of families in which some people are straight and some people are gay. Both findings were confirmed in a study of gay and straight brothers in For the first time, individual genes have been identified that may influence how sexual orientation develops in boys and men, both in the womb and during life.

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The finding is consistent with previous research showing a correlation between sexual orientation in men and the number of older brothers a man has, according to Anthony Bogaert, Ph. The new finding, in a study of nearly 1, men, is that only biological older brothers count. Being raised with adopted brothers or step-brothers with a different mother has no effect on the likelihood of a man growing up gay.

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Writing in the journal Sciencean international team of researchers report how they drew on existing genetic databases to conduct the largest study yet into genetics and same-sex sexual behaviour. The team stress that they did not focus on identity or orientation, and did not include transgender individuals. By looking at sexual behaviour and relatedness of individuals, they estimated that about a third of the variation in same-sex behaviour is explained by genetics.

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This is the process where DNA expression is influenced by any number of external factors in the environment. And in the case of homosexuality, the researchers argue, the environment is the womb itself. Writing in The Quarterly Review of Biologyresearchers William Rice, a professor at the University of California, Santa Barbara, and Urban Friberg, a professor at Uppsala University in Sweden, believe that homosexuality can be explained by the presence of epi-marks — temporary switches that control how our genes are expressed during gestation and after we're born. Specifically, the researchers discovered sex-specific epi-marks which, unlike most genetic switches, get passed down from father to daughter or mother to son.

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Gay men may be born and not made, new research indicates. A study of 1, heterosexual and homosexual men in Canada has found that the single most important factor that can be linked with male homosexuality is the number of elder brothers a man has in his family. Although this has been known for some years, the latest study demonstrates that the link appears to have nothing to do with whether a man is brought up with his elder brothers, and is therefore psychologically influenced by them.

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BERKELEY -- The level of male hormones in the womb can influence an unborn child's future sexual orientation, according to new research from a University of California, Berkeley, professor who used an unusual technique - measuring finger length - to gather evidence. Marc Breedlove, professor of psychology, also found that higher levels of these male hormones, or androgens, can create a greater than normal tendency for both males and females to develop a homosexual orientation. Breedlove looked at relative finger length because it is influenced by androgen levels in the womb and thus is an approximate measure of fetal androgen levels.

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London - Women who suffer stress during pregnancy increase the chance of their child being gay, according to a controversial new book. The lifestyle of pregnant mothers affects the sexuality of their unborn child, altering their hormones and the formation of their brains, it claims. Smoking or taking drugs can also result in a child who grows up to be gay, according to the book by Dutch neuroscientist Dick Swaab.

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By SciTechDaily December 12, According to a newly released hypothesis, homosexuality might not lie in DNA itself. Instead, as an embryo develops, sex-related genes are turned on and off in response to fluctuating levels of hormones in the womb, produced by both mother and child.

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The hormonal theory of sexuality holds that, just as exposure to certain hormones plays a role in fetal sex differentiationsuch exposure also influences the sexual orientation that emerges later in the adult. The hormonal theory of sexuality and gender identity holds that, just as exposure to certain hormones plays a role in fetal sex differentiation, such exposure also influences the sexual orientation and or gender identity that emerges later in the adult. Differences in brain structure that come about from chemical messengers and genes interacting on developing brain cells are believed to be the basis of sex differences in countless behaviors, including sexual orientation.

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Gay couple celebrates pride [illustrative]. The study's findings were published by Science on August 29, According to a report by Naturethe study, which was conducted onparticipants, found five markers on the human genome that were linked to same-sex behavior, yet none were reliable enough to predict one's sexuality. Melinda Mills, a sociologist at the University of Oxford, said the study is "a solid study," but she also said it might not be representative of the overall population.

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