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

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

From Huberman Lab by Scicomm Media

March 30, 2026 · 2h 12m · Episode 274

About this episode

Dr. Marc Breedlove discusses the impact of hormones on sexual orientation and behavior.

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 sexual orientation. Throughout, we explain how nature and nurture interact to shape male-female differences, behavior, and romantic partner choice. Thank you to our sponsors AG1: https://drinkag1.com/huberman David: https://davidprotein.com/huberman Rorra: https://rorra.com/huberman Function: https://functionhealth.com/huberman Timestamps (00:00:00) Marc Breedlove (00:03:24) Hormones & Sexual Orientation (00:07:37) Prenatal Testosterone, Finger Ratio, Men & Women Differences (00:14:08) Sponsors: David & Rorra (00:16:46) Finger Ratios, Prenatal Testosterone, Gay & Straight Men/Women (00:23:57) Mice & Sex Differences, Androgens (00:26:54) Brain Differences & Sexual Orientation (00:33:52) Group…

People in this episode

Guest: Dr. Marc Breedlove

Topics covered

  • hormones
  • sexual orientation
  • brain development
  • prenatal testosterone
  • male-female differences
  • behavior
  • romantic partner choice

Keywords

  • hormones
  • sexual orientation
  • brain development
  • prenatal testosterone
  • finger-length ratios
  • male-female differences
  • romantic attraction
  • behavior
  • psychological development

Sponsors

AG1, David, Rorra, Function

Mentioned in this episode

Organizations: Michigan State University

Products: AG1, David, Rorra, Function

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