>>510593439A woman develops antibodies to testosterone making each son less masculine than the previous.
Fraternal Birth Order Effect:The most studied outcome of this hypothesis is the fraternal birth order effect, where the likelihood of a male child being homosexual increases with the number of older male siblings (but not female siblings). A 2018 meta-analysis by Blanchard estimated that each older brother increases the odds of homosexuality by about 33%.
This is thought to result from the motherโs immune response progressively reducing testosteroneโs masculinizing effects on the fetal brain, particularly in areas like the hypothalamus, which influences sexual orientation.
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