All I could find on this is something called “genetic sexual attraction” ^[1]^, though Wikipedia contains arguments that it’s pseudoscience ^[1.1]^. Here is a Reddit post asking about this. ^[3]^.
Related to this, I also came across the “Westermarck effect” which appears to suggest that people who grow up together are less likely to be romantically attracted to each other ^[2]^.
References
1. “Genetic sexual attraction”. Wikipedia. Published: 2024-10-14T18:46Z. Accessed: 2024-12-09T07:29Z. en.wikipedia.org/wiki/Genetic_sexual_attraction. 1. §“Criticism” > Critics of the hypothesis have called it pseudoscience. In a Salon piece, Amanda Marcotte called the concept “half-baked pseudoscientific nonsense that people dreamed up to justify continuing unhealthy, abusive relationships”.[8] The use of “GSA” as an initialism has also been criticized, since it gives the notion that the phenomenon is an actual diagnosable “condition”. > > Many have noted the lack of research on the subject. While acknowledging the “phenomenon of genetic sexual attraction”, Eric Anderson, a sociologist and sexologist, noted in a 2012 book that “[t]here is only one academic research article” on the subject, and he critiqued the paper for using “Freudian psycho-babble”. 2. “Westermarck effect”. Wikipedia. Published: 2024-09-26T14:09Z. Accessed: 2024-12-09T07:33Z. en.wikipedia.org/wiki/Westermarck_effect. 3. "How does nature prevent us from feeling sexually attracted to relatives who are objectively sexually attractive? ". Author: “Morgentau7” (u/Morgentau7). “r/TooAfraidToAsk”. Reddit. Published: 2024-09-25T17:50:08.227Z. Accessed: 2024-12-09T07:34Z. reddit.com/…/how_does_nature_prevent_us_from_feel….
olosta@lemmy.world 1 week ago
Second degree cousins is not that close though. If every generation has three children, that’s 27 persons. I thinks that for most of human history excluding second degree cousins from the acceptable partners pool would have been impossible. Communities were not that big.
spankmonkey@lemmy.world 1 week ago
I can’t stop laughing.
Enkrod@feddit.org 1 week ago
That’s how it’s phrased in many other languages, german for example.
BruceLee@sopuli.xyz 1 week ago
French also
HonoraryMancunian@lemmy.world 1 week ago
And if my maths is correct, you only share on average 12.5% of your DNA with them
mEEGal@lemmy.world 1 week ago
your math may be wrong, because we have very similar genomes, even compared to complete strangers. hell, even between some species.
HonoraryMancunian@lemmy.world 1 week ago
Well, yes. I meant in the sense we share on average 50% with each parent/siblings, 25% with grandparents, etc. I should have said genetics instead of DNA.
Knuschberkeks@leminal.space 1 week ago
iirc 90% of dna is the same even between humans and plants. (Don’t quote me on that)
porous_grey_matter@lemmy.ml 1 week ago
Of the variable alleles, not all DNA
Danquebec@sh.itjust.works 1 week ago
Groups often came together to party and marry people.
There are even rules, like exogamy is common.