1: Arch Sex Behav. 2003 Oct;32(5):403-17 Can some gay men and lesbians change their sexual orientation? 200 participants reporting a change from homosexual to heterosexual orientation. Spitzer RL. Biometrics Research Department, New York State Psychiatric Institute, New York, New York 10032, USA. firstname.lastname@example.org Position statements of the major mental health organizations in the United States state that there is no scientific evidence that a homosexual sexual orientation can be changed by psychotherapy, often referred to as "reparative therapy." This study tested the hypothesis that some individuals whose sexual orientation is predominantly homosexual can, with some form of reparative therapy, become predominantly heterosexual. The participants were 200 self-selected individuals (143 males, 57 females) who reported at least some minimal change from homosexual to heterosexual orientation that lasted at least 5 years. They were interviewed by telephone, using a structured interview that assessed same sex attraction, fantasy, yearning, and overt homosexual behavior. On all measures, the year prior to the therapy was compared to the year before the interview. The majority of participants gave reports of change from a predominantly or exclusively homosexual orientation before therapy to a predominantly or exclusively heterosexual orientation in the past year. Reports of complete change were uncommon. Female participants reported significantly more change than did male participants. Either some gay men and lesbians, following reparative therapy, actually change their predominantly homosexual orientation to a predominantly heterosexual orientation or some gay men and women construct elaborate self-deceptive narratives (or even lie) in which they claim to have changed their sexual orientation, or both. For many reasons, it is concluded that the participants' self-reports were, by-and-large, credible and that few elaborated self-deceptive narratives or lied. Thus, there is evidence that change in sexual orientation following some form of reparative therapy does occur in some gay men and lesbians.