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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.

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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 has one of its proponents as "the most consistent biodemographic correlate of sexual orientation in men".

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Research over sex years has pornhg 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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Secondly, the brother birth order effect operates through a biological mechanism during prenatal life, not during childhood or adolescence. The fraternal birth order effect has been confirmed to interact with handedness[19] [7] as the incidence of homosexuality correlated with an increase in older brothers is seen only in right-handed males.

Fraternal birth order and male sexual orientation - Wikipedia

Thirdly, the fraternal birth order effect has been demonstrated has diverse samples such as homosexual males from different races, [26] different cultures, [27] different historical eras, [5] [28] and widely separated geographic regions. The fraternal birth order effect is a phenomenon that can be described in one of two ways: After statistically controlling for number of older brothers, homosexual and heterosexual males do not differ in their mean number of older sisters, younger sisters or younger brothers.

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In a few studies, homosexual subjects have occasionally displayed both a jessica starr porn number of older brothers and a larger number of brother sisters in comparison to heterosexual men. This is because a person's number of older brothers and number of older sisters tend to sex positively correlated.