Sex hormone levels experienced by the fetus between the second and fifth months after conception are most likely to influence a male's sexual orientation in later life because of their impact on

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During the second to fifth months of fetal development, the brain is in a critical period of sexual differentiation, and the presence or absence of certain hormones can affect the development of brain regions related to sexual orientation. Therefore, sex hormone levels during this period can impact a male's sexual orientation in later life through their effect on brain development. The X and Y chromosomes determine genetic sex but do not directly influence sexual orientation, and sexually transmitted infections are not relevant to this developmental process.

Sex Hormone Levels Experienced by the Fetus Between the Second