In the final episode of her ten-part investigation of the online sperm donor marketplace, Dr Aleks Krotoski looks for a way to make this network safe for the recipients, the donors, and ultimately, the donor-conceived children.

The internet has opened up the door to these informal connections, and so who is responsible what happens there? Is it Facebook, where the majority of the exchanges take place? Is it for the regulator to crack down on illegal trades? Or is it up to the criminal justice system to draw boundaries around this activity?

Aleks discovers that, as with so many aspects of our lives, the digital revolution has pushed us right up to the boundaries of what we can and cannot do - and how quickly good intentions combined with tools to rule the world can get lost in selfish goals.