The fraternal birth-order refers to a factor associated with

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Fraternal birth-order refers to the correlation between having older brothers and the likelihood of being gay. Studies have shown that the more older brothers a man has, the higher the chance he will identify as gay or bisexual. This phenomenon is thought to be related to the mother's immune response to male-specific proteins that build up after each male pregnancy, which could potentially affect the hormonal development of subsequent male fetuses.

The Fraternal Birth-Order Refers to a Factor Associated with