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A reanalysis of subjects' responses to a Psychology Today sex questionnaire demonstrated that the relationship between extramarital sex (EMS), self-reported marital satisfaction, and divorce varies differentially for men and women by length of marriage. Divorce rates are higher for EMS than non-EMS women in young marriages and tend to be higher for EMS men in young and old marriages. EMS subjects generally report lower marital satisfaction than non-EMS subjects, except for women in young marriages and men in old marriages. Marital satisfaction declines the longer married, except for EMS husbands. Romanticism is lower for EMS subjects.
Glass et al. (Tue,) studied this question.