Why is it imperative to shun European women who've slept with non-Whites? Science. Male microchimerism occurs within the female brain whenever semen enters her body, through whatever orifice. This DNA is then passed along to any offspring she may later have...

Which means that some of the DNA from ALL previous partners will be passed onto ALL offspring she may have in future. The findings are proven in this white paper: https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0045592#s3

It is likely that the institution of marriage was created to stop the female behavior of using multiple partners so as to have the semen compete for her eggs. The issuance of the progeny then became a matter of patriarchal lineage, and tribes and families became more distinct...

63% of women in the test pool had multiple male DNA sequences that did not belong to their husbands. In 100% of cases, this was so if the woman had a history of abortions. In other words, Mudsharks will pass African DNA onto your children. That is science. So, choose wisely...