How many gay men owe their sexual orientation to fraternal birth order?

Archives of Sexual Behavior
James M CantorAnthony F Bogaert

Abstract

In men, sexual orientation correlates with the number of older brothers, each additional older brother increasing the odds of homosexuality by approximately 33%. However, this phenomenon, the fraternal birth order effect, accounts for the sexual orientation of only a proportion of gay men. To estimate the size of this proportion, we derived generalized forms of two epidemiological statistics, the attributable fraction and the population attributable fraction, which quantify the relationship between a condition and prior exposure to an agent that can cause it. In their common forms, these statistics are calculable only for 2 levels of exposure: exposed versus not-exposed. We developed a method applicable to agents with multiple levels of exposure--in this case, number of older brothers. This noniterative method, which requires the odds ratio from a prior logistic regression analysis, was then applied to a large contemporary sample of gay men. The results showed that roughly 1 gay man in 7 owes his sexual orientation to the fraternal birth order effect. They also showed that the effect of fraternal birth order would exceed all other causes of homosexuality in groups of gay men with 3 or more older brothers and would precisely equ...Continue Reading

Citations

Apr 24, 2009·Archives of Sexual Behavior·Gene SchwartzAlan R Sanders
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Jan 7, 2017·Archives of Sexual Behavior·Michael C Seto
Nov 4, 2017·Archives of Sexual Behavior·Nathan T Bartlett, Peter L Hurd
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Dec 13, 2017·Proceedings of the National Academy of Sciences of the United States of America·Anthony F BogaertRay Blanchard

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