Andrew Huberman· PhD
The devices are now commercially sold. Believe it or not, they're sold over-the-counter and on the internet, so people will even do this at home.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The devices are now commercially sold. Believe it or not, they're sold over-the-counter and on the internet, so people will even do this at home.
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But there are some clinics that have figured out methods in which they can take a sperm sample and they can spin that sperm sample in a centrifuge at a rate that separates out the sperm into what are called different fractions.
The other thing that is becoming clear to us in more recent years is that sex selection is actually possible at the level of the sperm even prior to fertilization.
And indeed, some couples who can conceive naturally are opting for IUI in order to be able to select biological sex because of this ability to spin out the sperm samples to different fractions and select the male or female sperm.
They also, of course, can choose to do this outside the context of in-vitro fertilization. So some people are now opting to have their sperm samples spun out in this way, separate out the sperm that give rise to male or female offspring, and then to only use the fraction that they are interested in-- so if they want a boy, they'll use one fraction. If they want a girl, they'll use different fraction-- and then to use those fractions in the context of what's called IUI, or intrauterine insemination, which is, as the name suggests, rather than having the man deliver the ejaculate with his penis and the sperm with his penis, they have a device.
And what these clinics have figured out is that if they spin the sperm sample at the correct spin rate that the sperm that will give rise to male offspring and the sperm that will give rise to female offspring segregate out into different fractions, allowing them to take each of those fractions separately and to apply them to eggs, if it's in-vitro fertilization, and give rise very reliably, certainly much more than chance, to either male or female embryos.