Sexual attraction to transgender people has been the subject of scientific study and social commentary. Psychologists have researched sexual attraction toward trans women, cross dressers, non-binary people, and a combination of these. Publications in the field of transgender studies have investigated the attraction transgender individuals can feel for each other. The people who feel this attraction to transgender people name their attraction in different ways. Cisgender men attracted to transgender women primarily identify as heterosexual and sometimes as bisexual, but rarely as homosexual, and may even regard their attraction as its sexual orientation and invent their own terms for it. Transgender individuals often call their attraction to other transgender people T4T and may consider it both a sexual identity and a form of political identity. Cisgender attraction to transgender people Scientific study Despite being referred to as a paraphilia by several researchers, having a sexual preference for transgender people is neither diagnosable as a mental illness nor as a paraphilic disorder. In their sociological study, Martin S. Weinberg and Colin J. Williams interviewed 26 men sexually interested in transwomen (MSTW). 13 identified themselves as heterosexual, and 13 as "bisexual or probably bisexual". The authors opined "These labels only superficially describe their sexual interest," and noted that the expressed interest in trans women was sometimes used as a basis for denying a more stigmatized self-identity. As an example, they described a case who "said that he was 'bisexual' rather than 'gay' because he was able to think of the transwomen as women". As part of HIV prevention research in 2004, Operario et al. interviewed 46 men in the San Francisco area who had sex with transgender women, but found "no consistent patterns between how men described their sexual orientation identity versus their sexual behavior and attraction to transgender women". Of the sample, 20 of them described themselves as being straight or heterosexual. Some men were definitive about this declaration, while others were hesitant and wondered if they should consider themselves bisexual. A Northwestern University study recruited 205 men interested in trans women. In that online survey, 51% identified as straight, 41% as bisexual, and the remainder as gay. Also, 55% said their ideal partner would be a cisgender female, and 36% said it would be a trans woman. The study authors concluded that "The interest in trans women appears to be a distinct sexual interest separate from heterosexual men's attraction to