We investigated men's experience with unwanted sexual activity—including unwanted kissing, petting, or intercourse—engaged in because of physical or psychological pressure or from societal expectations about male sexuality. We developed a questionnaire asking if respondents had ever engaged in unwanted sexual activity for any of 51 reasons. This questionnaire was administered to 507 men and 486 women. More women (97.5%) than men (93.5%) had experienced unwanted sexual activity; more men (62.7%) than women (46.3%) had experienced unwanted intercourse. Using factor analysis, we grouped the 51 questionnaire items into 13 general reasons; we then compared percentages of men and women who had engaged in unwanted sexual activity for these 13 reasons. There were seven sex differences in reasons for unwanted sexual activity: Five were more frequent for women than men; two reasons were more frequent for men than women—peer pressure and desire for popularity. There were eight sex differences in reasons for unwanted intercourse; more men than women had engaged in unwanted intercourse for all eight. The double standard for male and female sexuality and implications for therapy are discussed.