Contrary to statements made in the media controversy surrounding the Christian ex-gay movement today, this paper will demonstrate that the declassification of homosexuality as a mental illness by the American Psychiatric Association in 1973 did not amount to an instant "born again" conversion in psychological thought, nor did it signify the power of special interest politics trumping "true" science. An analysis of statements in multiple psychology textbooks and encyclopaedias published after 1970 will show that declassification initiated a near two-decade long "debate" in which conflicting scientific studies were used strategically and governmentally, sometimes in combination with the deployment of extreme stereotypes, to influence public and professional perceptions of an event with which many professionals disagreed. However, by the time the transformation in thought was complete-a transformation that was influenced by both the AIDS crisis and an antigay Christian media campaign-it had all but vanquished those who maintained a mental illness model of homosexuality from the disciplines of the psyche. It also culminated in the blaming of the Judeo-Christian tradition for psychiatry and psychology's longstanding antigay prejudice and recognized the ex-gay movement as a contemporary problem for psychiatry and psychology.