Blanchard's transsexualism typology (also Blanchard autogynephilia theory (BAT) and Blanchard's taxonomy) is a psychological typology of male-to-female transsexualism created by Ray Blanchard through the 1980s and 1990s, building on the work of his colleague, Kurt Freund. Blanchard divides male-to-female (MtF or M2F) transsexual people into two different groups: "homosexual transsexuals", who are attracted to men, and "non-homosexual transsexuals", who are "autogynephilic" (sexually aroused at the thought or image of themselves as a woman). The typology does not purport to identify the cause of transsexualism in natal males, but it has some implications for the cause—specifically, that the cause of transsexualism may not be the same for both groups.
Scientific criticism of the research and theory has come from John Bancroft, Jaimie Veale, Larry Nuttbrock, Charles Allen Moser, and others who argue that the theory is poorly representative of MtF transsexual people, reduces gender identity to a matter of attraction, is non-instructive, and that the research cited in support of the theory has inadequate control groups or is contradicted by other data. Supporters of the theory include J. Michael Bailey, Anne Lawrence, James Cantor, and others who argue that there are significant differences between the two groups, including sexuality, age of transition, ethnicity, IQ, fetishism, and quality of adjustment.
The theory has been the subject of protests in the transsexual and larger LGBT community, although it has its supporters. The issues with Blanchard's work were again the subject of criticism with the publication of Bailey's The Man Who Would Be Queen in 2003. In 2005, Blanchard distanced himself from Bailey's affirmation of the scientific certainty of the etiology.
Read more about Blanchard's Transsexualism Typology: Background, New Terminology, Autogynephilia and Autoandrophilia, "Non-homosexual" Versus "homosexual" Transsexual People, Justification For The Two Classifications, Scientific Criticism of The Terminology, Scientific Criticism of The Theory, Transsexual Community Reaction