Santorum has argued that contraception is morally wrong because, "It’s a license to do things in a sexual realm that is counter to how things are supposed to be." But human beings happily experience, witness, imagine, and lament a cornicopia of erotic encounters that couldn’t possibly result in conception. Leaving aside the many "perversions" happily practiced by humans the world over, the human female is available even for Vatican-approved missionary position intercourse—at least theoretically—when she’s menstruating, already pregnant, post-menopausal, or otherwise precluded from conceiving. Is this, too, an abomination? …

It’s the nature of the human beast. For Homo sapiens, sex is primarily about establishing and maintaining relationships—relationships often characterized by love, or at least affection. Reproduction is a by-product of human sexual behavior, not its primary purpose.