Children born from this sperm donor have since been identified in eight different European countries: Belgium, Denmark, France, Germany, Greece, Spain, Sweden and the UK.
The man's actions have raised concerns about the mental health of the children of serial sperm donors, who may suffer from anxiety over the possibility of incest and inbreeding with so many half-siblings around.
UK's Clive Jones has met 20 of the 129 children he has fathered and wants to go on donating sperm for a few more years until his count is 150. He does not charge any money.
The first child of in vitro fertilization was born in 1978 and in the decades since, sperm donation has become a thriving global business, as fertility clinics, sperm banks and private donors have sought to meet the demand of parents eager to conceive.