When Maxey was a medical student at the University of Michigan, his first wife, a nurse at a fertility clinic, persuaded him to start donating sperm to infertile couples. Maxey became the go-to stud for the clinic because his sperm had a high success rate of making women pregnant, which brought in good money for the clinic. Maxey himself made about $20 a donation, but says he was motivated to donate more out of a strong paternal instinct and sense of altruism. "I loved having kids, and to have these women doomed to wandering around with no family didn't seem right, and it's easy to come up with a semen donation," he says. . . .