The actress Nicole Kidman recently had a daughter, but you'd never know it, because Kidman was never actually pregnant. She and her husband, country star Keith Urban, were unable to conceive, so they hired a surrogate to have the baby for them. The idea of surrogate motherhood has been controversial since the very first surrogate baby was born in the seventies. In that case, the surrogate who carried the baby changed her mind and wanted to keep the baby, but the courts ruled that the she had given up her rights, and left the baby with family. It's no less controversial now. Just recently Australia cracked down on overseas surrogates because, they said, women in third world countries were being forced to carry babies against their will, and another shocking case in Illinois: A 61-year-old woman gave birth to her own grandson because her daughter was unable to have children.Another controversy surrounding surrogacy is what's called serial-surrogacy. That's women who get pregnant seven or eight times. Karen Synesiou is the director of the Center For Surrogate Parenting. In a recent article she says women who do it over and over again put serious strain on their bodies. Synesiou says she has to turn those women down because she worries that they have some kind of psychological problem. The physical strain of surrogacy is intense. One woman we read about, who carried four surrogate children, gave birth to twins a full trimester early, and with her final surrogacy, she developed a deadly condition called pre-eclampsia, which permanently damaged her heart.Emotionally, physically and ethically, there are a lot of issues surrounding surrogacy. In fact it's still illegal in 12 states and much of Europe. On the one hand it's a way for couples who can't conceive to have a biological child. On the other hand, some people see it as basically renting a womb.