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The Order Your Siblings Were Born In May Play A Role In Identity And Sexuality
Apr 10, 2024
Guest host Selena Simmons-Duffin delves into the 'fraternal birth order effect' on sexuality, where the likelihood of being gay increases with each older brother. She discusses the global studies, debunked research, and societal impacts of this phenomenon.
12:25
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Quick takeaways
- The fraternal birth order effect indicates a higher likelihood of male same-sex attraction with more older brothers.
- Women in same-sex marriages also show the pattern of having more older brothers, challenging previous male-focused hypotheses.
Deep dives
The Fraternal Birth Order Effect in Sexuality Research
Studies have shown a consistent increase in the probability of male same-sex attraction for individuals with more older brothers. This fraternal birth order effect, documented all over the world, indicates that men with same-sex attraction tend to have a higher number of older brothers. The maternal immune hypothesis proposes that antibodies produced by mothers in response to male-specific proteins may influence the development of subsequent male fetuses, potentially explaining this phenomenon.
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