Sperm donors father huge 'families' in Canada, United States

Sperm donors father huge 'families' in Canada, United States

In a stranger-than-fiction twist, Toronto documentary maker Barry Stevens has used his experiences -- born in Britain through a donor who then went on to sire some 500 to 1,000 children during his three decades working with sperm banks -- to fuel his own work.

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"We can't exclude the possibility that children of one donor can meet and have sex, and children, and indeed the possibility that the donor himself could have sex with his daughter," said Stevens, who has made films about his search for his real father and his half-siblings.