This is the Dutch man who may have fathered more than 500 children across Europe.
Jonathan Jacob Meijer, from the city of Hague, is accused of misleading hundreds of women by telling them he would only help conceive a maximum of 25 children.
Advocacy group The Donor Child Foundation is suing the 41-year-old to prevent him from donating even more sperm.
Authorities reportedly blacklisted the musician in 2017, after the Dutch Society of Obstetrics and Gynaecology flagged him for having helped conceive 100 babies through 10 different clinics.
But national press say this did not stop Meijer. He allegedly continued to provide his services in Denmark and Ukraine via websites and social media accounts.
The Donor Child Foundation’s case is also being brought by a Dutch woman, who is only referred to as Eva.
She felt ‘sick to her stomach’ when she discovered the extent to which Meijer had donated his sperm.
She said: ‘If I had known he had already fathered more than 100 children I would never have chosen him.
‘Many mothers have told him he needs to stop, but nothing helps. So going to court is the only option I have to protect my child.’
Eva and the foundation hope to keep Meijer from fathering more donor children, as well as determining the actual number of clinics through which he has provided sperm to hopeful parents.
She further wants any of his sperm that may remain in storage to be destroyed, provided that it has not been requested by one of the women with whom he has already had a child.
Chairman of The Donor Child Foundation, Ties van der Meer, said: ‘We are taking action against this man because [our] national government is doing nothing.
‘He has a global reach via [the] internet and he does business with large, international sperm banks.’
If the figures are accurate, the number of Meijer’s offspring would place him well ahead of Clive Jones, a retired UK maths teacher who previously claimed to be the ‘world’s most prolific sperm donor’ after fathering almost 130 children.
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