Marriage in the West isn’t doing very well because it’s in direct confrontation with the evolved reality of our species. What we argue in the book is that the best way to increase marital stability, which in the modern world is an important part of social stability, is to develop a more tolerant and realistic understanding of human sexuality and how human sexuality is being distorted by our modern conception of marriage. Certainly growing up in the '70s and '80s there were very few kids I knew whose parents weren’t divorced at least once. The economic, emotional, psychological cost of fractured relationships is a major problem in American society — with single mothers and single-parent families. [. . .] The advent of agriculture changed everything about human society, from sexuality to politics to economics to health to diet to exercise patterns to work-versus-rest patterns. It introduced the notion of property into sexuality. [. . .] When you have agriculture, men st...