LeVay's studies indicate a correlation between a man's sexual orientation (homosexuality vs. heterosexuality) and the:

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LeVay's studies found that there was a difference in the size of one particular nucleus in the hypothalamus (the INAH-3) between heterosexual and homosexual men. This suggests that there may be a neurological basis for sexual orientation. The other options, testosterone and estradiol levels, as well as the size of a nucleus in the medulla, did not show a significant correlation with sexual orientation in LeVay's studies.

LeVay's Studies Indicate a Correlation Between a Man's Sexual Orientation