Michael CastlemanMichael Castleman is a medical journalist who has written about sexuality for nearly fifty years, over which he's answered more than 12,000 sex questions. During the past decade, his Q&A site GreatSexGuidance.com and twice-monthly blog All About Sex n PsychologyToday.com have attracted more than 50 million views, helping Michael become the most popular sex writer in the world. Library Journal called him one of the nation's leading health writers. He resides in San Francisco, California. Read More Read Less