A birth-order effect seems to play a role in sexual orientation among

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Research has shown a correlation between birth order and sexual orientation, particularly in men who are right-handed. This phenomenon, often referred to as the fraternal birth order effect, suggests that the more older brothers a man has, the greater the likelihood of him being gay. This effect is believed to be related to biological factors that occur in the mother's womb and is most consistently observed in right-handed males.

A Birth-Order Effect Seems to Play a Role in Sexual