Back in the 70s it was seen as a noble community service, giving real hope to infertile couples. Sperm donors, mostly young men, mostly students who did their bit to help create happy families. And in Australia alone, an estimated 10,000 babies were born, thanks to this artificial insemination program. A happy ending you'd think. But no, those babies have grown up and many are disenchanted. Some are desperate to trace their biological fathers. And some feel so cheated, they want the whole program stopped to prevent any more children being born this way.