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Dr. Marc Breedlove

๐Ÿ‘ค Speaker
985 total appearances

Appearances Over Time

Podcast Appearances

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

And so the wolfian ducts don't develop.

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

The periphery looks like a typical female.

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

And these individuals, when they're born, often are not identified because the baby's born.

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

The doctor does that very careful analysis by looking between the legs and says, congratulations, you have a girl.

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

And they grow up to be girls, undetected.

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

And they come to a doctor's attention when puberty happens.

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

And all their classmates are having their period.

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

but she's not.

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

And so she'll eventually go to an OBGYN who will first do an exam, a vaginal exam, and he'll notice that the vagina is relatively short because the inner part of the vagina is normally derived from the malaria ducts.

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

Well, in this woman, in this teenage girl, the malaria ducts never develop because of anti-malarian hormone.

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

So there'll be no cervix.

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

that can be seen in the exam, and if he takes blood plasma levels, he'll see that this very feminine looking girl, teenage girl, has very high levels of testosterone.

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

And presumably testes.

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

And if he does a karyotype, he'll see that she has an XY karyotype, and yes, there are testes in there, typically in the abdomen, and they're releasing lots of testosterone because there's no negative feedback to tell the brain

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

you know, hey, you can stop sending signals to the testes now.

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

In these cases, you can ask, well, what's the sexual orientation of these women?

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

And the vast majority of them grow up to be straight.

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

They are attracted to men.

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

And they might be very, they're often very interested in having a family.

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

Of course, they can't carry children themselves, but