The personality characteristics of male clients of female sex workers and their motivations for seeking the services of sex workers were examined. It was hypothesized that clients of sex workers would differ from nonclients in that they would adopt less feminine sex roles, exhibit lower social-sexual effectiveness, and show higher levels of sensation-seeking behavior. Sixty-six clients of sex workers and 60 nonclients volunteered to complete a short questionnaire to assess demographic characteristics, sex role, social-sexual effectiveness, and sensation-seeking behavior. Clients and nonclients did not differ on demographic variables such as age, education, marital status, or occupation. However, clients were significantly less feminine in sex-role orientation, scored lower in social-sexual effectiveness, and scored higher on sensation seeking. Closer analysis of the client group revealed the existence of two distinct subgroups. The first was characterized by low social-sexual effectiveness and appeared motivated to visit sex workers because of an interpersonal need for intimacy. The second was characterized by high sensation seeking and appeared motivated to visit sex workers because of a need for novelty and variety in sexual encounters.