Is there any data that shows mental differences between gay and straight?

In a review of the literature, Gonsiorek (1982) argued there was no data showing mental differences between gays and straights–or if there was any, it could be attributed to social stigma. Similarly, Ross (1988) in a cross-cultural study, found most gays were in the normal psychological range. However some papers did give hints of psychiatric differences between homosexuals and heterosexuals. One study (Riess, 1980) used the MMPI, that venerable and well-validated psychological scale, and found that homosexuals showed definite “personal and emotional oversensitivity.”
In 1991, the absolute equality of homosexuality and heterosexuality was strongly defended in a paper called “The Empirical Basis for the Demise of the Mental Illness Model” (Gonsiorek, 1991). But not until 1992 was homosexuality dropped from the psychiatric manual used by other nations–the International Classification of Diseases (King and Bartlett, 1999)–so it appears the rest of the world doubted the APA 1973 decision for nearly two decades.

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