This book combines Christian theology, Enlightenment liberalism, and modern social science to defend the marital family as an essential institution for adults and children, regardless of sexual orientation. John Witte presents the marital family as an integrated sphere with natural, social, economic, communicative, contractual, and spiritual dimensions. He rejects modern efforts to abolish the legal category of marriage or to reduce it to a transient and malleable sexual contract. While celebrating the sexual liberty of consensual adults, Witte calls for stable marital families and responsible sex and parentage as the surest and safest path to private flourishing and social stability for all.