Perhaps the biggest argument for monogamy is the moral argument. Most religious groups do not accept polygamy and believe it is a sin against nature and against one another. Even the first residents of Earth, Adam and Eve, were monogamous, and this tradition has continued throughout history in the Christian religion. In addition, there are emotional considerations to think about in polygamous relationships that are usually not present in monogamous relationships. Women may become jealous of each other, especially if the husband pays more attention to one woman rather than another. Even experts note that in polygamous relationships, it is common for two individuals to "pair up" and bond more fully than all the individuals in the group (Fisher 73). In addition, monogamy is natural, while polygamy is not. Author Fisher maintains, "Human beings almost never have to be cajoled into pairing. Instead, we do this naturally. We flirt. We feel infatuation. We fall in love. We marry. And the vast majority of us marry only one person at a time" (Fisher 72). Thus, monogamy is much more natural to us than polygamy. It is how humankind has conducted courtship and relationships for centuries, and that is because that is what...

Professor Gerald McKay notes, "Civilized life in modern industrialized societies depends, to some extent, on the stability and security provided by monogamous arrangements. Western religious teachings have long supported the idea of monogamy as does most of contemporary Western civilization" (McKay). For the most part, civilizations that have actively practiced polygamy have not survived or have altered their behavior in time. Thus, monogamy is the way marriage works best in our society. It is natural, it is Christian, and it simply makes sense.
References

Fisher, Helen E. Anatomy of Love: The Natural History of Monogamy, Adultery, and Divorce. New York: Norton, 1992.

Gibbs, Tyson, and Judith Campbell. "Practicing Polygyny in Black America: Challenging Definition, Legal and Social Considerations for the African-American Community." The Western Journal of Black Studies 23.3 (1999): 144.

McKay, Gerald. "The Myth of Monogamy: Fidelity and Infidelity in Animals and People." The Canadian Journal of Human Sexuality…