fraternal birth order effect

noun

Definitions

  1. The scientific observation that a man's statistical probability of being homosexual…

    The scientific observation that a man's statistical probability of being homosexual increases with the number of older brothers he has.

    • Thus the fraternal birth order effect is specific to male sexual orientation, and does not affect female sexual orientation.
    • 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 […]

The neighborhood

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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA