Poly Books
Sex at Dawn: The Prehistoric Origins of Modern Sexuality is a book co-authored by Christopher Ryan, Ph.D and Cacilda Jethá, MD ( Portuguese pronunciation: [kɐˈsiɫðɐ ʒɨˈta] ), first published in 2010 by the Harper imprint of HarperCollins . For the paperback, published July 5, 2011, the book's subtitle was changed to "How We Mate, Why We Stray, and What It Means for Modern Relationships." As of 2012, Sex at Dawn has also been published in Korea, Finland, Australia, New Zealand, Japan, Spain, China, Poland, Russia, Ukraine, Romania, and Albania.
Sex at Dawn
The Ethical Slut
The Ethical Slut: A Guide to Infinite Sexual Possibilities ( ISBN 1-890159-01-8 ) is an English language non-fiction book written by Dossie Easton and Janet Hardy (given as pseudonym Catherine A. Liszt for the book's first edition).