How Older Brothers Affect Male Sexuality | Dr. Marc Breedlove & Dr. Andrew Huberman

Dr. Marc Breedlove and Dr. Andrew Huberman discuss the fraternal birth order effect, the maternal immunization hypothesis, and why older brothers raise the odds of being gay. Dr. Marc Breedlove is a professor of neuroscience at Michigan State University and an expert on how hormones shape brain development and sexual orientation. Dr. Andrew Huberman is a tenured professor of neurobiology and ophthalmology at Stanford University School of Medicine and host of the Huberman Lab podcast. Watch the full episode: https://youtu.be/6-mEiwe2NhE Show notes: https://go.hubermanlab.com/iJe27oR *Timestamps* 00:00 Older Brothers & Sexual Orientation 01:44 Sex Ratio of Older Siblings 02:40 Linear Effect per Brother 03:15 No Individual Predictive Value 04:36 Social Upbringing Hypothesis 05:43 Stepbrothers vs Biological Brothers 06:11 Maternal Immunization Hypothesis 07:34 Neuroligin 4Y Antibodies 08:56 Many Paths to Sexual Orientation 09:35 Sisters & Younger Brothers #HubermanLab #MarcBreedlove #SexualOrientation Disclaimer & Disclosures: https://www.hubermanlab.com/disclaimer