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Noun: "the scientific observation that a man's statistical probability of being gay increases with the number of older brothers he has"
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- 2008, Glenn Wilson & Qazi Rahman, Born Gay: The Psychobiology of Sex Orientation, Peter Owen (2008), →ISBN, page 98:
- Thus the fraternal birth order effect is specific to male sexual orientation, and does not affect female sexual orientation.
- 2010, Mark J. T. Sargeant, "Brain and Behaviour: Sex Differences", in Essential Psychology: A Concise Introduction (eds. Philip Banyard, Mark N. O. Davies, Christine Norman, & Belinda Winder), SAGE Publications (2010), →ISBN, page 183:
- The influence of the fraternal birth order effect is not mediated by a male growing up with older stepbrothers but is influenced by them having biological brothers (who share the same mother) regardless of whether they are raised together or apart (Bogaert, 2006).
- 2012, Alexander K. Hill, "Biological Foundations of Sexual Orientation", in Handbook of Psychology and Sexual Orientation (eds. Charlotte J. Patterson & Anthony R. D'Augelli), Oxford University Press (2012), →ISBN, page 62:
- Blanchard and Klassen (1997) proposed the maternal immune hypothesis to explain the fraternal birth order effect.
- 2013, Mark Cook, Levels of Personality, Cambridge University Press (2013), →ISBN, page 310:
- They estimate one in seven gay men 'owes his sexual orientation to the fraternal birth order effect'.
- 2014, Tuck C. Ngun & Eric Vilain, "The Biological Basis of Human Sexual Orientation: Is There a Role for Epigenetics?", in Epigenetic Shaping of Sociosexual Interactions: From Plants to Humans (ed. Daisuke Yamamota), Academic Press (2014), →ISBN, page 172:
- The fraternal birth order effect is one of the most replicated and robust findings in sexual orientation research. Each son increases the odds of homosexuality in the next son by 33% relative to the base population rate