Couples who marry young are expected to struggle and to come out stronger for it. Hence, the cornerstone model “doesn’t condone infidelity so much as it concedes its near-inevitability.” In contrast, he observes, “The capstone model is much less forgiving of sexual betrayal because it presumes that those who finally get around to marrying should be mature enough to be both self-regulating and scrupulously honest. . . . The evidence suggests, however, that the capstoners are more than a little naïve if they imagine that a rich set of premarital life experiences will serve as an inoculation
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