Over the course of 2 semesters, 341 women and 294 men anonymously completed questionnaires. They were asked to describe their most recent date (to provide normative data on dating) and their worst experience with SA during a date, if applicable. The authors assessed possible risk factors in three ways. For people who had been involved in SA, they compared the characteristics of their SA dates and their recent dates; anything occurring more often on SA dates than on recent dates might be a risk factor. They compared the most recent dates of people who had versus had not experienced SA to identify differences in their dating habits. They compared attitudes of people who had versus had not been involved in SA. Results showed that 77.6 percent of the women and 57.3 percent of the men had been involved in some form of SA; 14.7 percent of the women and 7.1 percent of the men had been involved in unwanted sexual intercourse. Variables that appear to be risk factors are the man's initiating the date, paying all the expenses, and driving; miscommunication about sex; heavy alcohol or drug use; 'parking'; and men's acceptance of traditional sex roles, interpersonal violence, adversarial attitudes about relationships, and rape myths. The length of time that dating partners have known each other seems unrelated to the risk of SA. Implications for rape-prevention programs are discussed. (Author abstract modified)