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

Marc Breedlove

Hormones & Sexual Orientation

Prenatal Testosterone, Finger Ratio, Men & Women Differences

Sponsors: David & Rorra

Finger Ratios, Prenatal Testosterone, Gay & Straight Men/Women

Mice & Sex Differences, Androgens

Brain Differences & Sexual Orientation

Group vs Individual Differences, Height Analogy; Bisexuality

Brain Development, Hormones & Behavior; Brain Plasticity

Sponsor: AG1

Sexual Behavior, Libido

Gay Rams, Brain Differences

Aversion Pathway, Men vs Women, Same-Sex Partner

Congenital Adrenal Hyperplasia (CAH), Intersex Phenotypes

Androgen Insensitivity Syndrome (AIS)

Sponsor: Function

Gay Men & Older Brothers, Maternal Immunization Hypothesis

CAH Carriers, Advantage, Stress Tolerance

Birds & Sexual Differentiation, Gynandromorphs

Anabolic Steroids, Hypersexuality; Adult Brain Plasticity

Age & Testosterone Decline; Sexual Orientation & Activities

Marc's Academic Journey, Ozarks, Luck

Exploration; Kids & Sex Differences