This article presents a study of sex-typed service images based on gender research in marketing and service encounter theory. The purpose is to address the issues of how and why services as distinct from products acquire a sex-typed image. Two streams of research provide the variables hypothesized to influence sex- image determination: gender research provides individual variables related to the consumer him/herself, and service encounter research provides variables related to the service itself. Consumer variables include an individual's biological and psychological sex image and personal use, while service variables deal with the sex image of the firm's characteristic provider and typical customer. A study conducted to test the hypotheses that both sets of variables influence a service's sex-typed image is presented. Marketing implications for development and promotion of new services and re-positioning of extant ones are discussed.