"Papa loved Mama, so they got married and had babies." Thus does my earnest four-year-old summarize the mysteries of marital love. For scientific purposes that statement is terribly incomplete. For philosophical purposes, it hits the bull's eye. With those words Phil Lawler began a Wall Street Journal op-ed in March of 1996. His child's perspective stands in instructive contrast to an article in today's New York Times titled, "Talking With Children About Sex and AIDS: At What Age to Start?" The answer suggested in the lede is "How about, oh, 4?" The reporter tells us this is the subject...