According to the European Sperm Bank, around 15 percent of all couples in Germany cannot have children. At least not in a natural way. The solution for many couples is sperm donation. But what are these men who choose to be genetic fathers of children they will never raise, perhaps never know? Nicholas is one of them. He is in his early 30s and wishes to remain anonymous. Also in the sense of those who may have become parents thanks to his sperm donation.
Now read on with STERN PLUS
What you really need to know: Backgrounds, analyses
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