Marriage age

The minimum age at which a person is able to lawfully marry, and whether parental or other consents are required, vary from country to country. In the U.S. the minimum age for marriage without parental and/or judicial approval is 18 except for Nebraska (19) and Mississippi (21); but most states allow exceptions to the general minimum age in some circumstances (see Marriage age in the United States).^[21] In England and Wales the general age at which a person may marry is 18, but 16- or 17-year-olds may get married with their parents' or guardians' consent. If they are unable to obtain this, they can gain consent from the courts, which may be granted by the Magistrates' Courts, or the county or High Court family divisions.

Gender restrictions

Legal, social, and religious restrictions apply in all countries on the genders of the couple.

In response to changing social and political attitudes, some jurisdictions and religious denominations now recognize marriages between people of the same sex. Other jurisdictions have instead "civil unions" or "domestic partnerships", while additional others explicitly prohibit same-sex marriages.

In 1989, Denmark became the first country to legally recognize a relationship for same-sex couples, establishing registered partnerships, which gave those in same-sex relationships "most rights of married heterosexuals, but not the right to adopt or obtain joint custody of a child".^[22] In 2001, the Netherlands became the first country in the world to legalize same-sex marriage.^[23][24] As of 2023, marriage between same-sex couples is legally performed and recognized in 34 countries, namely the Netherlands, Belgium, Spain, Canada, South Africa, Norway, Sweden, Portugal, Iceland, Argentina, Denmark, Brazil, France, Uruguay, New Zealand, Luxembourg, the United States, Ireland, Colombia, Finland, Malta, Germany, Australia, Austria, Taiwan, Ecuador, United Kingdom, Costa Rica, Chile, Switzerland, Slovenia, Cuba, Mexico, and Andorra.^[25]

Civil union, civil partnership, domestic partnership, and registered partnership statuses offer varying legal benefits of marriage. As of 12 January 2024, countries that have an alternative form of legal recognition other than marriage on a national level are: Bolivia, Croatia, Cyprus, the Czech Republic, Estonia, Greece, Hungary, Italy, Liechtenstein, Monaco, Montenegro, and San Marino.^[26][27]

Kinship restrictions

Kinship is two people that are related by blood or adoption, such as brother, sister, mother, father, aunt, uncle etc. No European country prohibits marriage between first cousins. The U.S. is the only western country with cousin marriage restrictions. Societies have often placed restrictions on marriage to relatives, though the degree of prohibited relationship varies widely. In most societies, marriage between brothers and sisters has been forbidden, with ancient Egyptian, Hawaiian, and Inca royalty being prominent exceptions. In many societies, marriage between first cousins is preferred, while at the other extreme, the medieval Catholic Church prohibited marriage even between distant cousins.

In the United Kingdom, the Deceased Wife's Sister's Marriage Act 1907 removed the previous prohibition for a man to marry the sister of his deceased wife. In Australia, marriage with an ancestor or descendant is prohibited, as is a marriage between a brother and a sister, whether of whole blood or half-blood and even if the brother or sister has been adopted.

All mainstream religions prohibit some marriages on the basis of the consanguinity (lineal descent) and affinity (kinship by marriage) of the prospective marriage partners, though the standards vary.

Social restrictions

In the Indian Hindu community,^[29] especially in the Brahmin caste, marrying a person of the same gotra was prohibited, since persons belonging to the same gotra are said to have identical patrilineal descent. In ancient India, when gurukuls existed, the shishyas (pupils) were advised against marrying any of guru's children, as shishyas were also considered the guru's children and it would be considered marriage among siblings. However, there were exceptions, including Arjuna's son Abhimanyu's marriage to Uttra, the dance student of Arjuna in Mahabharata. The Hindu Marriage Act, 1955 brought reforms in the area of same-gotra marriages, which were banned prior to the act's passage. Now the Indian constitution allows any consenting adult heterosexual couple (women 18 or older and men 21 or older) from any race, religion, caste, or creed to marry.

Many societies have also adopted other restrictions on whom one can marry, such as prohibitions of marrying persons with the same surname, or persons with the same sacred animal. Anthropologists refer to these sorts of restrictions as exogamy. In South Korea, marriage between people having the same surname and belonging to the same clan was prohibited by the Article 809 of the Korean Civil Code, until the act was determined "non-conforming to the Constitution" in 1997. ^[30]

Societies have also at times required marriage from within a certain group. Anthropologists refer to these restrictions as endogamy. An example of such restrictions would be a requirement to marry someone from the same tribe. Racist laws adopted by some societies in the past—such as Nazi-era Germany, apartheid-era South Africa, and most of the United States in the nineteenth and the first half of the 20th century—and which prohibited marriage between persons of different races could also be considered examples of endogamy.

In modern Israel, the status of marriage is the same as it was historically under the Ottoman Empire and the British mandate, where civil marriage does not exist and authority for marriage is given by the state solely to the recognized religious denominations (Orthodox Judaism, Islam, Druze, and ten Christian denominations (primarily Orthodox Christianity and Catholicism, but also including the Episcopal Church).^[31] Israeli couples who wish to contract a marriage that are not allowed under the auspices of any of these religious denominations (including same-sex marriages, marriages involving Israelis of Jewish descent who are not recognized by the state as Jewish and marriages between non-Jewish Arab citizens of Israel and Israeli Jews) or simply wish to get legally married outside the auspices of one of these institutions cannot do so in Israel itself. However, Israel does recognize civil marriages between Israeli citizens that are contracted abroad, including same-sex marriage, so couples in these situations will often hold a non-binding ceremony in Israel and fly abroad (often to nearby Cyprus) to contract a legal marriage that is then recognized in Israel.^[32]

In the U.S., many laws banning interracial marriage, which were state laws, were gradually repealed between 1948 and 1967. The U.S. Supreme Court declared all such laws unconstitutional in the case of Loving v. Virginia in 1967.^[33]

Polygamy

  Polygamy is only legal for Muslims

  Polygamy is legal

  Polygamy is legal in some regions (Indonesia)

  Polygamy is illegal, but practice is not criminalised

  Polygamy is illegal and practice criminalised

  Legal status unknown

• In India, Malaysia, Philippines and Singapore polygamy is only legal for Muslims.
• In Nigeria and South Africa, polygamous marriages under customary law and for Muslims are legally recognized.
• In Mauritius, polygamous unions have no legal recognition. Muslim men may, however, "marry" up to four women, but they do not have the legal status of wives.

Polygamy—being married to more than one spouse—is illegal in most countries. Where polygamous marriages are allowed, it is typically polygyny that is permitted. While accepted by some societies, it is far less common than monogamy.^[34]

Polygamy is normally not permitted in most western countries, although some recognize bona fide polygamous marriages that were performed in other countries. Polygamy is practiced illegally by some groups in the United States and Canada, primarily by certain Mormon fundamentalist sects that separated from the mainstream Latter Day Saints movement after the practice was renounced in 1890.^[35]

Many societies, even some with a cultural tradition of polygamy, recognize monogamy as the only valid form of marriage. For example, People's Republic of China shifted from allowing polygamy to supporting only monogamy in the Marriage Act of 1950 after the Communist revolution.

In Islam, polygamy is permitted by the Quran (4:3) which states "If you fear you might fail to give orphan women their ˹due˺ rights ˹if you were to marry them˺, then marry other women of your choice—two, three, or four. But if you are afraid you will fail to maintain justice (between your wives) then ˹content yourselves with˺ one or those ˹bondwomen˺(slaves) in your possession. This way you are less likely to commit injustice (to the orphan girls in your care)." [This verse is from a para which is setting out rules for adoption of orphans.] ^[36]

Africa has the highest rate of polygamy in the world.^[37] In India, only Muslims are allowed to practice polygamy.^[38]

Polygamy, taking the form of polygyny, is most common in a region known as the "polygamy belt" in West Africa and Central Africa, with the countries estimated to have the highest polygamy prevalence in the world being Burkina Faso, Mali, Gambia, Niger and Nigeria.^[39] In the region of sub-Saharan Africa, polygyny is common and deeply rooted in the culture, with 11% of the population of sub-Saharan Africa living in such marriages (25% of the Muslim population and 3% of the Christian population, as of 2019).^[39] Polygyny is especially widespread in West Africa, with the countries estimated to have the highest polygyny prevalence in the world as of 2019 being Burkina Faso (36%), Mali (34%) and Gambia (30%).^[39] Outside of Africa, the highest prevalence is in Afghanistan, Yemen and Iraq. ^[39]

Medical examination

Beginning in the early 20th century, a number of jurisdictions have mandated premarital medical testing or examinations for one or both parties. One of the most commonly mandated was a blood test for syphilis. Between the 1930s and 1950s, most US states passed laws requiring both parties to a marriage to undergo a Wassermann test (or equivalent) for syphilis. If one of the parties was found to have communicable syphilis, they would generally be prevented from marrying until they underwent treatment to resolve the infection. Before the availability of penicillin after World War II, the treatment of syphilis entailed a course of arsenic-based drugs for up to a year or more. These statutes were eventually repealed between the 1970s and 2000s, because they were considered to no longer be a cost-effective public health measure.^[40]

In the 1980s and 1990s, many US state legislatures considered laws requiring premarital HIV testing, though only a small number were adopted, and were only briefly active before being repealed.^[41] As of 2010, premarital HIV testing is legally mandated in Bahrain, certain provinces of China, Libya, Saudi Arabia, the United Arab Emirates, and Uzbekistan.^[42]