Everything You Always Wanted to Know About Sex (But Were Afraid to Ask) is a book (1969, updated 1999) by U.S. physician Dr. David Reuben. It was one of the first sex manuals that entered mainstream culture in the 1960s and had a profound effect on sex education and in liberalizing attitudes towards sex.
The book was translated into 54 languages and sold in 52 countries and ultimately reached more than 150 million readers. In 1972 it was loosely adapted by Woody Allen into a comedy film of the same name.
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