Our guest today is a journalist and sex writer, Michael Castleman. Michael has covered sexuality and sex therapy for 47 years. He 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 53 million views. The free Q&A site he has published since 2010, GreatSexGuidance.com, has attracted 2 million more. His two previous sexuality guides—Sexual Solutions (1980) and Great Sex (2004)—have sold more than 600,000 copies.

Michael Castleman has answered more than 12,000 sex questions from people of all ages and sexual inclinations around the world. In addition to his Q&A site, he spent 10 years (1997-2007) answering sex questions from customers of Xandria, then a major sex toy marketer, and five years (1991-1995) answering the sex questions submitted to Playboy's "Advisor" column. He has also answered questions for WebMD and several other Web sites, magazines, and call-in radio shows. For more, visit his Wikipedia page.

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