The Fraternal Birth Order Effect Is Robust and Important

@article{Bailey2018TheFB,
  title={The Fraternal Birth Order Effect Is Robust and Important},
  author={J. Michael Bailey},
  journal={Archives of Sexual Behavior},
  year={2018},
  volume={47},
  pages={17-19}
}
  • J. Bailey
  • Published 2018
  • Psychology, Medicine
  • Archives of Sexual Behavior
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  • S. Luoto
  • Medicine
    Frontiers in Psychology
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Psychological sex differences have been studied scientifically for more than a century, yet linguists still debate about the existence, magnitude, and causes of such differences in language use.
Birth Order and Sibling Sex Ratio in Androphilic Males and Gynephilic Females Diagnosed With Gender Dysphoria From Iran.
TLDR
The fraternal birth order effect that was found for the transgender androphilic males, similar to that found in gay men, suggests a common underlying causal mechanism and generalizability for the study of birth order and sibling sex ratio that has been restricted to Western samples of adults diagnosed with gender dysphoria.
The Association Between Fraternal Birth Order and Anal-Erotic Roles of Men Who Have Sex with Men
  • C. Wampold
  • Psychology, Medicine
    Archives of sexual behavior
  • 2018
TLDR
Late fraternal birth order was correlated with receptive anal-erotic behavior among MSM, and Bottoms had a significantly greater mean number of older brothers than did Not-Bottoms.

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  • Psychology, Medicine
    Archives of sexual behavior
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TLDR
The fraternal birth order effect is the tendency for older brothers to increase the odds of homosexuality in later-born males and in homosexual subjects with masculine versus feminine gender identities is compared and evidence for the reliability of the effect was consistent.
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TLDR
The results yielded some evidence confirming prior findings that non-right-handedness is associated with homosexuality in men and women, that older brothers increase the odds of homosexuals in men, and that the effect of older brothers on sexual orientation is limited to right-handed men.
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This study provides population-based, prospective evidence that childhood family experiences are important determinants of heterosexual and homosexual marriage decisions in adulthood.
Interaction of fraternal birth order and handedness in the development of male homosexuality
TLDR
Evidence is found for an interaction between two of the best established etiologic factors in the literature on male homosexuality: fraternal birth order and hand preference and the number of non-right-handed homosexuals with older brothers is smaller than expected.
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Meta-analysis of aggregate data from 14 samples representing 10,143 male subjects shows that homosexuality in human males is predicted by higher numbers of older brothers, but not by higher numbers
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