Bruce Bagemihl, PhD., is the author of the controversial book Biological Exuberance: Animal Homosexuality and Natural Diversity, which first argues that homosexual and bisexual behaviors are rife through the natural world, and then proposes an overarching theory of natural sexuality in which reproduction is only one of its principal biological functions. (Among others, Bagemihl proposes group cohesion and lessening of tensions, as in the behavior of bonobos.)
He served on the faculty of University of British Columbia, and Biological Exuberance was cited in the U.S. Supreme Court case Lawrence v. Texas as evidence that male-male-sodomy exists in nature and is no product of human sexual perversion.
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