>>939347104
Jews are so inbred 2 out of 3 carry recessive genetic alleles that will result in diseased children if they have kids together. They are highly encouraged to get screened before they start dating someone so that there aren't emotional problems when they are forced to break up because their kids would be diseased inbred babies.

Source is a Jewish genetic testing organization, not some Nazi propaganda site, lol.

https://www.sawyouatsinai.com/jewish-dating-medical.aspx