The third interstitial nucleus of the anterior hypothalamus is a brain area implicated in sexual orientation.

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Research has suggested that the third interstitial nucleus of the anterior hypothalamus may play a role in sexual orientation. Specifically, studies have found that this brain region tends to be larger in heterosexual men compared to homosexual men and women. However, it's worth noting that sexual orientation is likely determined by a complex interplay of genetic, hormonal, and environmental factors, and the exact role that any specific brain region plays remains unclear.

The Third Interstitial Nucleus of the Anterior Hypothalamus Is a Brain