Physiological research related to sexual orientation has focused the most on which of the following characteristics?

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Physiological research related to sexual orientation has focused the most on finger length pattern. This research suggests that there may be a correlation between the length ratio of the index and ring fingers (known as 2D:4D ratio) and sexual orientation. Studies have found that gay men tend to have a smaller 2D:4D ratio (meaning their ring fingers are longer compared to their index fingers) while lesbian women have a larger 2D:4D ratio (meaning their index fingers are longer compared to their ring fingers) compared to heterosexual individuals.

Physiological Research Related to Sexual Orientation Has Focused the Most