This is called Telegony, a racist pseudoscience created to justify keeping the races separate. It popular now in Eastern Europe, especially Russia. Russian men use it as an excuse to attack black and brown men flirting with "their" women. Women will often hide the fact they have slept with a black man to avoid retaliation from their spouses.
You're perpetuating nazi propaganda for free, congrats
I use it in reverse..fukk'em...they use it cause once they women have brothers they don wan demand nomo