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https://geneticliteracyproject.org/2024/08/03/marrying-your-cousin-there-may-be-evolutionary-benefits/

 

"Having children with your eighth, sixth, or even a fifth cousin, is not inbreeding, whereas first-cousin parenting is inbreeding to such a degree that there are laws dealing with it. But fascinating research shows that the highest human fertility rates exist among couples who are 3rd cousins. Fertility is a good way to assess evolutionary fitness, because lethal traits due to recessive genes frequently manifest as spontaneous abortions, typically occurring so early in gestation that they’re rarely even noticed as a pregnancy.

And so, it’s been suggested that the 3rd cousin level of inbreeding might represent a kind of genetic sweet spot, where the advantages of amplifying positive family traits and the disadvantages of amplifying negative family traits are optimally balanced."

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