| Sumario: | A study was conducted to examine the incidence, prevalence, and correlates of extramarital sex (EMS) in the U.S. Data were drawn from a nationally representative sample of 884 men and 1,288 women. Results revealed that 22.7 percent of men and 11.6 percent of women reported having previously engaged in EMS. However, the proportion of men and women who reported having EMS during the past year differed nonsignificantly at 4.1 percent and 1.7 percent, respectively, when the probability value for multiple tests was accounted for. Apart from the oldest cohort, the lifetime incidence of EMS increased with age for men, and for women, there was a curvilinear relationship such that lifetime incidence of EMS was greatest among those between the ages of 30 and 50. A higher incidence of EMS was related to the occurrence of divorce and greater attitudinal acceptance of EMS, and there were no gender differences in attitude toward EMS among those who did report having had EMS and among those who did not report having EMS.
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