Several studies by Ames (1997), Gladue (1990), and Meyer-Bahlburg (1995) conclude that there is a critical period in a fetus’ development that predisposes the person to be attracted to a particular sex later in life. This critical period has to do with the brain’s neural-hormonal control system. So female fetus’ that were exposed to testosterone were more like to become lesbians later in life, while male fetus’ that were exposed to increased levels of estrogen hormone were more likely to be gay.

Everything psychological is simultaneously biological.

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