Tom Perrotta's thirty-ish parents of young children are a varied and surprising bunch. There's Todd, the handsome stay-at-home dad dubbed "The Prom King" by the moms of the playground; Sarah, a lapsed feminist with a bisexual past, who seems to have stumbled into a traditional marriage; Richard, Sarah's husband, who has found himself more and more involved with a fantasy life on the internet than with the flesh and blood in his own house; and Mary...