Why is "Fraternal birth order and sexual orientation" trending?
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- Ranking position: #
- Date: 2026-04-08 06:01:50
This topic has appeared in the trending rankings 1 time(s) in the past year. While it does not trend frequently, its appearance suggests a renewed or concentrated surge of public interest.
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Wikipedia Overview
The fraternal birth order effect is an observation that the more older brothers a male has from the same mother, the greater probability he will have a homosexual orientation. It was identified by Ray Blanchard and Anthony Bogaert in the 1990s, who attributed the effect to a prenatal biological mechanism, as the association is only present in men with older biological brothers, and not present among men with older step-brothers. Hypothesized to be the result of a maternal immune response to male fetuses, whereby antibodies neutralize male Y-proteins thought to play a role in sexual differentiation during development, it would leave some regions of the male brain in the 'female typical' arrangement – resulting in attraction to males.
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