gwern comments on Poly marriage? - Less Wrong Discussion
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Should we use eugenic reasons forbid the marriage of women over 40 planing on having babies as well? The defect rate in children is the same just so you know. In the Western world most people are pretty out-bred, one generation of inbreeding does very little damage and very few Westerners will choose to marry their cousins generation after generation.
Yes. We should also encourage the use of sperm donors as resulting in 1/5 the birth defect rate. (On a large scale, this advantage would erode, but that is easily dealt with by encouraging men to donate more and treating them less like crap; we can think of it as 'sperm banking', akin to existing practice of 'egg banking'.)
Do you know this, or are you guessing? If I were to go looking for any studies in out-bred populations, at how many points of average IQ damage would you concede the point?
Ok you win eugenics is a good idea. But after designer babies are the norm, this rationale becomes obsolete.