A Netflix docuseries has put a spotlight on the unregulated world of sperm donation, particularly the lack of stopgap measures that might prevent donors who have been banned by one country from simply going elsewhere to donate more.

Released earlier this month, “The Man With 1000 Kids” explores the fallout from the case of serial sperm donor Jonathan Meijer, a Dutch man who fathered children around the globe via donations to sperm banks, as well as through private meetings he reportedly…