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

Mar 30, 2026 · 2h 12m · YouTube

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asr · 21,694 words · docs

0:00The larger the number of older brothers that a male has, the higher the probability that he is gay.

0:07It's been seen over and over.

0:09I mean, it's really one of the rock-solid findings in human sexuality.

0:14So the way to emphasize the difference is if a baby boy is born today, if he has no older brothers, his odds of being gay when he grows up is about 2%, right?

0:27Pretty low.

0:28But if he had one older brother, his odds go up by a third.

0:33Okay, 2.6.

0:34And if he has two older brothers, they go up a third again, right?

0:37Now we're at 3.5.

0:39It turns out you've got to have like a dozen older brothers just to have a 50-50 chance.

0:43Welcome to the Huberman Lab Podcast, where we discuss science and science-based tools for everyday life.

0:52I'm Andrew Huberman, and I'm a professor of neurobiology and ophthalmology at Stanford School of Medicine.

0:58My guest today is Dr.

0:59Mark Breedlove.

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