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. The theory is that the more older brothers a man has, the greater the probability is that he will have a homosexual orientation. It has sometimes been called the older brother effect. It has been estimated that 15% of the homosexual demographic is caused by fraternal birth order.
Read more about Fraternal Birth Order And Male Sexual Orientation: Empirical Basis, Contrary Evidence, Theories On The Cause
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