Apparently, this guy.
Jonathan Jacob Meijer is a Dutch rock musician who is a popular sperm donor. From the New York Times:
The Case of the Serial Sperm Donor
One man, hundreds of children and a burning question: Why?
By Jacqueline Mroz
Feb. 1, 2021
… Exactly how many donor children Mr. Meijer has around the world is impossible to say. But Ties van der Meer, the director of the Dutch Donor Child Foundation, and his colleagues have calculated that if Mr. Meijer’s known pattern of clinic and private donation was any indicator, the number could run to several hundred, even 1,000.
In an email, Mr. Meijer dismissed that conclusion. “I have approximately 250 children,” he said. “Assumptions of 1,000 are ridiculous. I am disappointed by the obsession of the numbers. I became a donor not for any numbers but out of love to help parents with realizing their dream. I cannot understand how anyone can only focus on numbers and see my donor children as a number.”
I suspect that musicians do so well with the ladies because they tend to look like they’d have beautiful daughters: e.g., Steven Tyler of Aerosmith and his daughter Liv Tyler. And this guy’s wavy long blond hair and white teeth sets women’s hearts to racing about how their daughter would be the belle of the ball.
The sperm bank that has long been the world’s biggest exporter is located in Denmark, suggesting blond Danes are the #1 choice of the women of the world.
On the other hand, I’m not sure my hair theory holds up when tested on Simon Watson, who looks longer on personality than on hair. From The Guardian:
I fathered 800 children, claims sperm donor
By Natalie Morton & Sarah Bell
Published 13 January 2016
Simon Watson, 41, has been an unlicensed sperm donor for 16 years, donating once a week.
“Usually one [baby] a week pops out. I reckon I’ve got about 800 so far, so within four years I’d like to crack 1,000,” he tells the Victoria Derbyshire programme..
“I’ve got kids all the way from Spain to Taiwan, so many countries. I’d like to get the world record ever, make sure no-one’s going to break it, get as many as possible.” …
Mr Watson, who has been married twice, has three children. It was after his first marriage ended that he started to donate.
“I thought I didn’t want to go through all that again, I’d much rather go down to a sperm bank, have kids there, and if they ever come and see me later that’s great, but if they don’t, they don’t,” he says.
He admits his motivation could be linked to boosting his ego.
“I didn’t get my first girlfriend until I was 18. I thought, ‘I’m never going to get married and have kids.’ A psychologist would say that’s where it stemmed from, but I don’t know, I’ve never been to one,” he explains. …
Mr Watson’s son Thomas helps him with his Facebook page. The 20-year-old says: “When a photo comes up it makes me happy and it’s nice to know I have another brother or sister out there. All the time you get another random brother or sister pop up and you’re like, ‘Wicked.'”
How hereditary is the urge to go down to the sperm bank and have 1000 kids? If it’s fairly heritable, that might aggregate into something big over a number of generations.
From The History of the 23rd Century:
Few in the 21st Century imagined that world history would come to be dominated by the struggle between the Watson and Meijer Superclans.