Joe and Susie could meet, fall in love and get married. They could have their own naturally created offspring. Scary, yeah?
DNA test
Yeah but will everyone be required to take a DNA test before marriage? What if Joe and Susie's genetic offspring(the ones they donated-not siblings known to each other) get jiggy on Spring Break, and the girl finds herself pregnant? Ooops, that's what abortion is for. /sarcasm
What happens if the offspring decide to do the right thing and get married, and raise the child? None of this is beyond the realm of possibility, imo. The smart, rich people float in their own environment, as do poor people, illegals, and criminals.