"Marriage is a legal union between a man and a woman as recognized by most of the United States. Internationally, and in certain U.S. political regions, a man and another man or a woman and another woman can be legally recognized as a married couple. What are typical marriage structures? The U.S. and world-wide culturally preferred marriage type today is monogamy. Monogamy is the marriage form permitting only one spouse at a time. Almost all who have married in the U.S. have done so monogamously since the original colonies in the 1600s. Monogamy implies a 1:1 relationship and is typically desired both by married couples and by opposite and same-sex cohabiters. Polygyny is a form of marriage permitting more than one wife at the same time. Polygyny is still common and legal in many African, Middle Eastern, Muslim, and Indian nations. It was a deep part of China's history and prior to World War II it was common for a Chinese man to have multiple wives and many children. Polyandry is a marriage form permitting more than one husband at the same time. This is historically and currently rare, and, if or when it was practiced, it often includes the marriage of one wife to a set of brothers with all husbands having sexual access to the wife. Polyandry was found among some Pacific Island cultures and among the pre-Taliban Afghanis."