This paper uses sociological theory to develop an ideal-typical model of homosexual identity formation. The four-stage model outlined here represents a synthesis and an elaboration on previous research and theorizing on homosexual identity development. The model describes how committed homosexuals, lesbians and gay males who see themselves as homosexual and adopt corresponding lifestyles, recall having acquired their homosexual identities. Often repeated themes in the life histories of gay males and lesbians, clustered according to life stages, provide the content and characteristics of each stage.