A typology of transsexualism: gender identity theory and data.

An analysis of postoperative data obtained from 42 male-to-female transsexuals showed them to fall into three distinct categories: homosexual transsexuals, asexual transsexuals, and heterosexual transsexuals. Additonal data covering the areas of gender vs. sexual dysphoria, surgical details, background characteristics, sexuality-related behaviors, and postoperative adaptation further differentiated these groups and suggest that the categorization is theoretically meaningful and relevant to understanding the causes and course of the transsexual phenomenon. An extensive developmental theory is suggested to account for both differences and commonalities among the different subgroups of transsexuals, as well as among these and related groups, such as effeminate homosexuality and transvestism. The theory is sufficiently specific for making empirical predictions.