Meaning of fraternal birth order effect | Babel Free

Definitions

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

uncountable

Examples

“Thus the fraternal birth order effect is specific to male sexual orientation, and does not affect female sexual orientation.”

“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).”

“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 […]”

CEFR level