In discreet laboratories all over the United States, some of the most valuable material in the world is deposited. It arrives by an obscure series of arrangements -- is often unregulated and always unseen. And it is sold at a price to desperate people prepared to do almost anything to conceive a child.
Welcome to the secret world of the sperm donor -- featured on "Nightline" tonight at 11:30 p.m. ET.
Kirk Maxey was one of the most generous sperm donors on the planet. As a medical...Full Story