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Michael Castleman is the world’s most popular sexuality writer. His twice-monthly blog on PsychologyToday.com, “All About Sex,” launched in 2009, has amassed more than 50 million views. The free Question & Answer site he has published since 2010, GreatSexGuidance.com, has attracted 2 million more.

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Michael Castleman is the world’s most popular sexuality writer. Since 2009, his blog on PsychologyToday.com, “All About Sex,” has amassed 50+M views. The free sex Q&A site he's published since 2010, GreatSexGuidance.com, has attracted 2M more.