http://www.touchstonemag.com/archives/article.php?id=18-06-022-f
"A parent of each sex is necessary to make the child, to raise the child, and to teach the child. To make him, both are needed because the female provides the egg, the male fertilizes it, and the female incubates the resulting zygote. To raise him, both are needed because the male is better designed for protection, the female for nurture. To teach him, both are needed because he needs a model of his own sex, a model of the other, and a model of the relationship between them. Mom and Dad are jointly irreplaceable. Their partnership in procreation continues even after the kids are grown, because then they are needed to help them establish their own new families."- Dr. J. Budziszewski, Designed for Sex- What We Lose When We Forget What Sex Is For, Touchstone