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In 1973, the American Psychiatric Association (APA) removed homosexuality from its Diagnostic and Statistical Manual (DSM), leading to changes in the broader cultural beliefs about homosexuality and culminating in the contemporary civil rights quest for marriage equality. This paper reviews the history of theories about human sexuality that led up to that event and outlines the current sociopolitical environment in which marriage equality debates are taking place as well as the current state of marriage equality in the United States and elsewhere.
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Jack Drescher (2012) studied this question.
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