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GENDER & SEXUAL ORIENT-
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More Sex Differences in the Brain?!
Another example of a sexually dimorphic structure of the brain is the 3rd interstitial nucleus of the anterior hypothalamus (INAH-3). The following is a diagram of a coronal section through the human hypothalamus. The nuclei are indicated by numbers:
 (image thanks to this site on Sexual Behavior
INAH-3 has been documented to be approximately 3 times as large in men than in women. Some scientists believe this is partly responsible for male-typical sexual behavior, including sexual attraction towards females.
 Hmmm... if a larger INAH-3 is found in men attracted to females, what if a male has a smaller INAH-3?
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