Assistant Professor of Psychology Dr. Justin K. Mogilski was recently published in Frontiers in Psychology: section Evolutionary Psychology.   The research title "Life History and Multi-Partner Mating: A Novel Explanation for Moral Stigma Against Consensual Non-monogamy"  attempts to explain how moral stigma toward non-monogamy evolved and how these attitudes may be mismatched to the modern environment.  You can read the article at Frontiers in Psychology.