'The Man with 1000 Kids' donor Jonathan Jacob Meijer denies mixing sperm to see who babies would resemble. He's demanding Netflix retract the claim.

• "The Man with 1000 Kids" claims that Jonathan Jacob Meijer mixed sperm samples with another donor.
• Meijer denied the claim in several YouTube videos.
• Meijer demanded that Netflix remove the allegation from the docuseries, and threatened legal action.

The prolific sperm donor at the center of Netflix's "The Man with 1000 Kids" has denied claims that he mixed his sperm with another donor's to see who the babies would resemble.