Polygamy may be abhorrent to most Americans, but in many parts of the global community it is common, normal, and accepted.
Although the percentage of men in the world who have more than one wife is relatively small, as much as a third of the world's population belongs to a community that allows it, says Israeli anthropologist Joseph Ginat.
There are many plural marriages in Africa, the Middle East, and Asia, said Ginat, professor of social and culture anthropology at the University of Haifa.
Many American Indian tribes allow polygamy; several experimental Christian groups practice it. And, of course, there are those famous offshoots of The Church of Jesus Christ of Latter-day Saints.
Polygamy is the most prevalent in Muslim countries, and in communities that are more traditional and agrarian. For example, it is common and growing among the 180,000 Bedouin of Israel. It is also frequent among some Mediterranean Jews living in Yemen.
But having multiple wives and families requires money, so in each society that permits polygamy, only 10% to 25% of men actually practice it, and most have only two wives, Ginat said. The men most likely to be involved are those with the most economic resources and most status in the community.
Today, as many Muslims are leaving the village for the city and adopting urban lifestyles, plural marriage is declining. When money becomes the basis of an economy, or when nuclear families replace an extended family network, the practice declines.
"When I was growing up in Bangladesh, my grandfather had two wives," said Iqbal Hossain, president of the Islamic Society of Greater Salt Lake City. "But now it is fast becoming a thing of the past."
History: Polygamy was an accepted practice among early Hebrews, including several revered biblical figures, such as Abraham, David, and Solomon.
Gershom probably thought of 1,000 years as an eternity, but that millennium ended in 1987, Ginat said.
However, Gershom was speaking only to Eastern European Jews (Ashkanazi). The Mediterranean (Sephardic) Jews continued to practice polygamy.
In Islam, a maximum of four wives is allowed by the Koran, the sacred writing of Islam's prophet Mohammed, under strict conditions.
"If you fear that you will not act justly towards the orphans, marry such women as seem good to you, two, three, four," says the Koran, "but if you fear you will not be equitable, then only one."
Mohammed had 10 wives and two concubines, according to Cyril Glasse in the Encyclopedia of Islam. He was married monogamously to his first wife, Khadijah, for 20 years, and she was the only one to bear him children. But after her death, he wed several widows and other women for the purpose of creating political alliances.
The Catholic Church frowned on the practice, but occasionally sanctioned second marriages of political leaders, said Ginat.
There was some experimentation with polygamy during the Middle Ages, Ginat wrote in his book, "Polygamous Families in Contemporary Society."
In the 1500s, Martin Luther tolerated polygamy in certain instances as a political necessity to "ensure the success of the Reformation," Ginat wrote. But he did not want it passed on to the Protestant masses.
Modern Israel: When Israel was established in 1948, the government prohibited polygamy. Those who already had several wives could bring them, but no new polygamous marriages could be formed.
However, in cases where a wife cannot bear children or is mentally ill, the rabbis can give a husband the right to marry a second woman without divorcing his first wife, Ginat said.
Despite the legal prohibitions, Israeli Bedouin, who are Muslims, continue to practice polygamy.
Muslim Nations: Polygamy is practiced openly in Jordan, Israel, Syria, Yemen, Iraq, and Iran, as well as some of the Muslim nations of North Africa--including Egypt, Sudan, Morocco, and Algeria.
These countries are made of mostly agricultural communities, where women are responsible for working the fields, while men work with the cattle.
The number of wives is "related to the amount of agricultural production a man can oversee," said the Rev. Patrick Gaffney, an Islamicist at the University of Notre Dame. "The more wives you have, the more productive the farm is."