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.
Show notes: https://go.hubermanlab.com/iJe27oR
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Dr. Marc Breedlove
Website: https://marcbreedlove.com
Academic profile: https://msu.edu/honoredfaculty/directory/breedlove-marc-stephen.html
Books: https://marcbreedlove.com/books
Publications: https://pubmed.ncbi.nlm.nih.gov/?term=breedlove+sm&sort=date
TED talk: https://www.youtube.com/watch?v=3HX-A89XI3I
Whom You Love lectures: https://www.youtube.com/user/WhomYouLove2012
LinkedIn: https://www.linkedin.com/in/marcbreedlove
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 vs Individual Differences, Height Analogy; Bisexuality
00:36:57 Brain Development, Hormones & Behavior; Brain Plasticity
00:42:52 Sponsor: AG1
00:44:16 Sexual Behavior, Libido
00:51:37 Gay Rams, Brain Differences
00:58:00 Aversion Pathway, Men vs Women, Same-Sex Partner
01:06:58 Congenital Adrenal Hyperplasia (CAH), Intersex Phenotypes
01:13:55 Androgen Insensitivity Syndrome (AIS)
01:18:14 Sponsor: Function
01:19:25 Gay Men & Older Brothers, Maternal Immunization Hypothesis
01:32:55 CAH Carriers, Advantage, Stress Tolerance
01:35:41 Birds & Sexual Differentiation, Gynandromorphs
01:41:32 Anabolic Steroids, Hypersexuality; Adult Brain Plasticity
01:45:31 Age & Testosterone Decline; Sexual Orientation & Activities
01:53:14 Marc’s Academic Journey, Ozarks, Luck
02:02:35 Exploration; Kids & Sex Differences
02:08:47 Zero-Cost Support, YouTube, Spotify & Apple Follow, Reviews & Feedback, Sponsors, Protocols Book, Social Media, Neural Network Newsletter
#HubermanLab #Science #Hormones
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