The Deep, Evolutionary History of Monogamy
While traveling through the highlands of Papua New Guinea, biological anthropologist Helen Fisher, Ph.D., met a man with three wives. The three wives didn't faze Fisher. Polygamy—the practice of marrying multiple spouses—has been permitted in PNG's mountainous region for generations, provided a husband can cover the increasingly hefty going bride price of livestock, shells and cash. Instead, what struck Fisher was the man's answer to her question, "How many wives would you like to have?"