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Midland is adorable. A correlation between fraternal birth order and male sexual orientation has been suggested by research. Ray Blanchard identified the association and referred to it as the fraternal birth order effect. Coitus reservatus In several studies, the observation is that the more older brothers a man has from the same mother, the greater the probability is that he will have a homosexual orientation. The fraternal birth order effect has been described by one of its proponents as "the most consistent biodemographic correlate of sexual orientation in men". Research over the years has established several facts. First, homosexual men do tend to have a higher birth order than heterosexual men, and this higher birth order is attributed to homosexual men having greater number of older brothers.

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The relationship between biology and sexual orientation is a subject of research. A simple and singular determinant for sexual orientation has not been conclusively demonstrated; various studies point to different, even conflicting positions, but scientists hypothesize that a combination of genetic, hormonal, and social factors determine sexual orientation. Biological theories for explaining the causes of sexual orientation are favored by experts [1] and involve a complex interplay of genetic factors, the early uterine environment and brain structure. A number of twin studies have attempted to compare the relative importance of genetics and environment in the determination of sexual orientation.

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Not a lifestyle thing, but specific gay genes remain to be pinned down Image: A genetic analysis of pairs of gay brothers, including sets of twins, has provided the strongest evidence yet that gay people are born gay. The study clearly links sexual orientation in men with two regions of the human genome that have been implicated before, one on the X chromosome and one on chromosome 8. The finding is an important contribution to mounting evidence that being gay is biologically determined rather than a lifestyle choice.

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For men, new research suggests that clues to sexual orientation may lie not just in the genes, but in the spaces between the DNA, where molecular marks instruct genes when to turn on and off and how strongly to express themselves. Ngun reported that in studying the genetic material of 47 pairs of identical male twins, he has identified "epigenetic marks" in nine areas of the human genome that are strongly linked to male homosexuality.

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