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Defenders and critics of the controversial Spitzer study analyze its methodologies and findingsIn 2001, Robert L. Spitzer, MD, presented his study on sexual conversion therapy with its controversial findings that some homosexuals can change their sexual orientation. The resulting media sensation and political firestorm enraged the study's critics and emboldened its supporters. Ex-Gay Research: Analyzing the Spitzer Study and Its Relation to Science, Religion, Politics, and Culture presents leading experts examining Spitzer's research methodology and findings to discern whether the

Homosexual men have a higher mean birth order than do heterosexual men, primarily because they have a greater number of older brothers. The purpose of this study was to determine whether the same difference occurs in homosexual vs heterosexual women. The probands were 964 homosexual and heterosexual, male and female volunteers, from whom birth order data were collected with self-administered questionnaires. The homosexual men had more older brothers than the heterosexual men, but they did not have more older sisters, younger brothers, or younger sisters. The homosexual women did not differ from the heterosexual women with regard to any class of sibling. These results are consistent with the hypothesis that the high birth order of homosexual men reflects the progressive immunization of certain mothers to H-Y antigen by succeeding male fetuses, and the increasing effects of H-Y antibodies on sexual differentiation of the brain in succeeding male fetuses.