Summary: World Renowned Psychologist and Book Author Christopher Ryan, Ph.D., joins "Upfront & Straightforward" Host Alan Roger Currie to discuss his research about the prehistoric origins of modern human sexuality as well as his book, Sex at Dawn: How we Mate, Why we Stray, and What it Means for Modern Relationships Christopher Ryan, Ph.D.'s main page Sex at Dawn on Amazon.com Alan Roger Currie on Amazon.com
