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The first generation of sperm donor babies is coming of age. And their voices are going to be heard...

Dr Kirk Maxey felt so sorry for childless people he became a sperm donor. The deal was total anonymity for him, with no responsibility.

Ten years later, Kirk and his wife began to wonder. What would happen if their child fell in love with a half-sibling? Hundreds had been born, most of them growing up relatively nearby.

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