Some sperm donors are fathering astonishing numbers of children worldwide, raising ethical questions about regulation and oversight. A recent BBC investigation highlighted a man whose sperm carried a genetic mutation linked to increased cancer risk in some of his offspring. His donations, sent to 14 countries, resulted in at least 197 children—a rare glimpse into the scale of the international sperm donation industry.
Sperm donation enables women to become mothers when natural conception isn’t possible, whether due to infertility, same-sex partnerships, or solo parenting. Demand has turned the practice into a booming industry, with the European market alone projected to exceed £2 billion by 2033, and Denmark emerging as a leading exporter.
Why so few men become donors
Becoming a sperm donor is far from easy. Fewer than 5% of volunteers meet the strict criteria. Donors must provide samples with high sperm count, motility, and healthy morphology, and their sperm must survive freezing and storage. Age restrictions, health screenings, and genetic testing further narrow the pool. In the UK, for example, around half of donor sperm is imported due to local shortages.
Because the donor pool is small, some men’s sperm is used far more frequently. Regular donations over weeks or months, combined with selective demand from recipients, can result in a single donor fathering hundreds of children. Popularity often comes down to perceived attractiveness or desirable traits—height, eye color, education, or profession—similar to the dynamics of dating apps, explains Prof Allan Pacey, a male fertility expert.
The Danish “Viking sperm” phenomenon
Denmark, home to major banks such as Cryos International, has developed a reputation for producing “Viking babies,” thanks to its high proportion of altruistic donors and relatively open cultural attitudes toward donation. Founder Ole Schou highlights that Danish donors often carry recessive traits like blue eyes and blonde hair, making them appealing to international recipients. Most requests now come from single, highly educated women in their 30s, who constitute 60% of clients.
Cross-border distribution and regulatory gaps
Sperm from a single donor can be distributed to multiple clinics across countries, with varying legal limits on how many children or families can result. This allows one donor to legally father dozens or even hundreds of children without their knowledge. Experts like Sarah Norcross argue that the risks of such widespread distribution should be better communicated, and suggest reducing the number of children per donor.
The European Commission is considering a pan-European sperm donor register following concerns about cross-border donations, while the European Society of Human Reproduction and Embryology has proposed immediate limits—50 families per donor, with a long-term goal of just 15 families. Critics warn that unlimited use can impact both donor-conceived children, who may discover hundreds of half-siblings, and donors themselves, who may be unaware of how widely their sperm is used.
Ethical considerations
The rise of DNA ancestry testing and social media amplifies these concerns, allowing connections between donors, children, and half-siblings that were previously impossible. Dr John Appleby, a medical ethicist, notes that widespread donor use creates a complex ethical landscape involving privacy, identity, consent, and dignity. While global regulation would help, he acknowledges it would be challenging to implement, and a worldwide donor registry carries its own legal and ethical complications.
Ultimately, experts argue that while sperm donation fulfills an important social need, the scale and reach of modern practices demand careful oversight to balance donor, recipient, and offspring interests.
