What has physiological research related to sexual orientation focused on?

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Physiological research related to sexual orientation has focused on finger-length patterns, particularly the ratio between the second and fourth fingers. Studies have found that lesbians tend to have a more masculine pattern, while gay men tend to have a more feminine pattern, suggesting that prenatal hormone exposure may be a factor in determining sexual orientation. Research on body shape, voice tone, and amount of body hair have not been consistent indicators of sexual orientation.

What Has Physiological Research Related to Sexual Orientation Focused On