A "surrogate mother" is a woman who, for financial or other reasons, agrees to bear a child for another woman who is incapable to conceive herself. In other words, she is a "substitute mother" that conceives, gestates and delivers a baby on behalf of another woman who is subsequently to be seen as the "real" (social and legal) mother of the child. Though the practice of surrogacy has already become a big market in western countries, it has also generated countless challenges for the law because it adds a third dimension to the meaning of motherhood. Like adoption, surrogacy separates the role of rearing mother from what the law has called the natural mother, but gestational surrogacy breaks the latter down into the roles of genetic mother and birth mother, leaving two women with biological connections to the child. Because surrogacy tends to commodify and dehumanize people, and because of all its legal, social, and psychological complications, it is obviously not wise to accept surrogacy as an alternative way of procreation.