Sperm donors father huge 'families' in US, Canada

MONTREAL, Canada - In a scenario straight from science-fiction, experts are increasingly concerned about lax rules for sperm donors in the United States and Canada where some men have anonymously fathered dozens of children.

Unlike in some countries such as France and Britain, there are no laws in either Canada or the US officially limiting the number of children who can be born from a single donor, the Canadian Health Ministry said.

An international norm places the ceiling at 20 pregnancies from the same donor. In Denmark, the limit on a single donor is 25 births. And most sperm banks set their own regulations.