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How Hormones Shape Sexual Orientation & Behavior | Dr. Marc Breedlove

Healthcare
United States
Started March 31, 2026

Dr. Marc Breedlove, PhD, is a professor of neuroscience at Michigan State University and an expert on how hormones shape brain development and sexual orientation. We discuss how prenatal testosterone impacts whether someone is romantically attracted to men or women later in life, and what correlates of sexual orientation — such as finger-length ratios — tell us about the role of hormones in brain and psychological development. We also discuss why the number of older brothers a male has biases...

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CLAIM Posted by will • Mar 31, 2026
Emphasizing biological factors in sexual orientation risks oversimplifying complex human experiences and identities.
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CLAIM Posted by will • Mar 31, 2026
Exploring the role of older brothers in influencing sexual orientation could unintentionally reinforce stereotypes about masculinity and family dynamics.
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CLAIM Posted by will • Mar 31, 2026
The link between prenatal testosterone and sexual orientation highlights the importance of biological research in understanding human behavior.
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CLAIM Posted by will • Mar 31, 2026
Research on hormones and sexual orientation should focus on individual variance rather than general trends, as personal experiences vary widely.
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CLAIM Posted by will • Mar 31, 2026
Understanding the hormonal influences on sexual orientation can foster greater acceptance and reduce stigma around diverse sexual identities.
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