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Alexander Comfort, MB BChir, PhD, DSc (10 February 1920 – 26 March 2000) was a British scientist and physician best known for his 1972 nonfiction sex manual, The Joy of Sex. He was an author of both fiction and nonfiction, as well as a gerontologist, anarchist, pacifist, and conscientious objector.
http://en.wikipedia.org/wiki/Alex_Comfort