A homosexual orientation is slightly more common among men who have an older brother.

Name: A homosexual orientation is slightly more common among men who have an older brother.
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Quizplus · Accepted Answer

This statement is true. It is known as the "older brother effect" and has been noted in several studies. The reason for this correlation is still not completely understood, but it is thought to be related to changes in the mother's immune system during pregnancy.

A Homosexual Orientation Is Slightly More Common Among Men Who