An older male influence in your family might have something to do with your sexuality, a study suggests.

According to a study published in journal Proceedings of the Royal Society B, research has revealed that having an older brother increases mens chances of being homosexual.

The studys researchers analyzed 10 separate sexual orientation studies that involved 5,400 men with info regarding their birth order.

The study revealed that men with older brothers have a 38% higher likelihood of being gay compared to men who dont have an older brother.

(Older) brothers increase the probability of homosexuality in later-born males, the study noted.

The information presented also showed that the more older brothers a man had, the higher chance that he would be homosexual. The study stated having three older brothers doubled a mans chances of being gay.

The study also found that mothers of homosexual males bear more children compared to mothers of heterosexual males.

David Spiegelhalter, a statistician and professor at the University of Cambridge, told the Daily Mail that the fascinating study estimates that having an older brother increases the odds of being gay by 38%, supporting the idea that a mothers immune response to having a male child influences subsequent boys.

People have endlessly argued about the possible roles of genetics and upbringing, but this clear result fits in neither category, he said.

The researchers failed to find a connection between sexuality and birth order for women, noting theres no pattern of siblings, their gender or age that would help determine whether a female would be a lesbian.

Much prior research has shown that females do not influence the sexual orientation of their younger siblings, and females sexual orientation is not affected by their numbers of older siblings, study author Dr. Ray Blanchard stated in an interview with the Daily Mail.

The studys authors state they arent sure why their findings are the case, stating they believe it may be attributed to a theory known as maternal immune hypothesis which believes women who give birth to male babies develop antibodies that impact brain development of future male children they have.

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Boys with older brother more likely to be gay: Study - Calgary Sun

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