Marc Breedlove
Professor of neuroscience at Michigan State University and a leading researcher on how hormones shape brain development, sexual differentiation, and sexual orientation. Known for influential work on prenatal hormones, behavior, and sex differences across species.
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Mar 30, 2026 • 2h 12min
How Hormones Shape Sexual Orientation & Behavior | Dr. Marc Breedlove
Marc Breedlove, a Michigan State neuroscientist who studies hormones and brain development, explores how prenatal testosterone may influence later attraction. He gets into finger-length ratios, why older brothers can slightly shift the odds, and what cases like CAH and AIS reveal. There’s also a look at gay rams, brain differences, and how nature and nurture interact.
