A husband is a male in a marital relationship. The rights and obligations of a husband regarding his spouse, others, and his status in the community and in law, vary between cultures and have varied over time.
In monogamous cultures, there may be only two parties to a marriage. This is enforced by legal codes which outlaw bigamy. In polygamous cultures, there may be more than two parties to a marriage.
In heterosexual marriages, the husband was traditionally regarded as the head of the household and was expected to be the sole provider or breadwinner, a role which is still maintained in some cultures which are sometimes described as paternalistic.
The term continues to be applied to such a man who has separated from his spouse and ceases to be applied to him only when his marriage has come to an end following a legally recognized divorce or the death of his spouse. On the death of his spouse, a husband is referred to as a widower and after a divorce a man may be referred to as "ex-husband" of his former spouse.
In today's society a husband is not necessarily considered the breadwinner of the family, especially if his spouse has a more financially rewarding occupation or career. In such cases, it is not uncommon for a husband to be considered a stay-at-home father if the married couple have children.
Origin and etymology
The term husband refers to Middle English huseband, from Old English hūsbōnda, from Old Norse hūsbōndi (hūs, "house" + bōndi, būandi, present participle of būa, "to dwell", so, etymologically, "a householder").
At the conclusion of a valid wedding, the marrying parties acquire the status of married person and, while the marriage persists, a man is called a husband. In heterosexual marriages the woman is called a wife; in same-sex marriages between males, each male is called a husband; between females, each is called a wife. Regardless of gender, a married person is the spouse of the other party to the marriage.
Although "husband" is a close term to groom, the latter is a male participant in a wedding ceremony, while a husband is a married man after the wedding and for the duration of the marriage. The term husband refers to the institutionalized role of the married male, while the term father refers to the male in context of his offspring, a state which may or may not indicate that a marriage ceremony has taken place.
In some cases of heterosexual marriage, before the marriage, he or his family may have received a dowry, or have had to pay a bride price, or both were exchanged. The dowry not only supported the establishment of a household, but also served as a condition that if the husband committed grave offenses upon his wife, he had to return the dowry to the wife or her family. For the time of the marriage, they were made inalienable by the husband. When the husband dies, he might leave his wife (or wives), then widow (or widows), a dower (often a third or a half of his estate) to support her as dowager.
"Husband" further refers to the institutionalized form in relation to the spouse and offspring, unlike father, a term that puts a man into the context of his children. Also compare the similar husbandry, which in the 14th century referred to the care of the household, but today means the "control or judicious use of resources", conservation, and in agriculture, the cultivation of plants and animals, and the science about its profession.
As an external symbol of the fact that they are married, each spouse commonly wears a wedding ring on the ring finger; whether this is on the left or right hand depends on the country's tradition.
In premodern times (ancient Roman, medieval, and early modern history), a husband was supposed to protect and support not only his wife and children, but servants and animals of his domain, and the father (as the "patron") was awarded with much authority, differing from that of his wife (in these cultures, no polygamy existed).
In the Middle Ages and Early Modern European history, it was unusual to marry out of love, but then doing so became an influential ideal. During this period, a husband had more opportunities in society than his wife, who was not recognized as legally independent.
In contemporary secularized Western culture, the rights of the spouses have been made equal. The civil marriage generally forces the wealthier spouse "breadwinner" to provide alimony to the former spouse, even after separation and also after a divorce (see alsoLaw and divorce around the world).
The legal status of marriage allows each spouse to speak on the other's behalf when one is incapacitated (e.g., in a coma); a husband is also responsible for his wife's child(ren) in states where he is automatically assumed to be the biological father.
In Islamic marital jurisprudence, husbands are considered protectors of the household and their wives. As protector, the husband has various rights and obligations that he is expected to fulfill and thus is offered opportunities different from that of his wife or wives, not only in legal and economical affairs of the family but within the family as well. As in most cases in Islam law and culture, everything is being related to the Qur'an.
Many Muslims may agree on a perfectly equal relationship. Islam is the only major religion that puts a cap on polygamy, limiting the number of a man's wives to four—provided the husband can do justice to all of them. Although some religions, such as Catholicism for instance, puts a cap on polygamy all together, or even serial monogamy, allowing one spouse until death does them apart, not even accepting divorce. According to the teachings of Islam a Muslim man should have a valid reason and have to get permission from his existing wife (without any force) if he requires to marry again. Islam vehemently abhors any intimate relationship outside the bond of marriage.
There is no external sign to show his status as a husband, unless he adopted the tradition of wearing a wedding ring.
See also: Marriage in Hinduism
A Hindu husband traditionally took his wife to his home, hardly ever to return to her family. As a result, he was expected to provide for her and to prove his abilities to do so. The marriage before modernity was a contract between families, similar to the Western (then: European) marriage. In modern times, equal rights for women and a modern jurisdiction have offered marriage out of love and civil marriage, different from the traditional arranged marriages. In Hinduism, there is a "grah shatak" and the actual wedding on two different days.
The Encyclopædia Britannica mentions that "In Hindu law, the male members of a joint family, together with their wives, widows, and children, are entitled to support out of the joint property."
Buddhism and Chinese folk religions
China's family laws were changed by the Communist revolution; and in 1950, the People's Republic of China enacted a comprehensive marriage law including provisions giving the spouses equal rights with regard to ownership and management of marital property.
In Christianity, according to the Bible, a husband has a number of honors:
- To present his bride to God throughout their lives as perfectly holy and virtuous as can be.
- To protect his wife with his own life, physically, emotionally and "spiritually".
- To "lay down" his life, counting her more important than himself.
- To lead his wife and his family into the best things for them.
- To be the best that he can be in God's power.
- To not withhold his body from her.
In Japan, before enactment of the Meiji Civil Code of 1898, all of the woman's property such as land or money passed to her husband except for personal clothing and a mirror stand.
Expectation of fidelity
Main articles: Adultery and Open marriage
Although there is generally an expectation for a spouse not to have sexual relations with anyone other than his spouse(s), historically, in most cultures, this expectation was not as strong as in the case of wives, a situation which was evident in legal codes which prohibited adultery, with male adultery often being criminalized only if "aggravating" circumstances existed, such as if he brought his mistress in the conjugal home, or if there was public scandal. The double standard was also evident in divorce laws of many countries, such as the UK or Australia, which differentiated between female adultery, which was a ground of adultery by itself, and male adultery, which was a ground only under certain circumstances. This double standard continues to be seen today in many parts of the world. For instance, in the Philippines, a wife can be charged with the crime of Adultery (for merely having one act of sexual intercourse with a man other than her husband), while a husband can only be charged with the related crime of Concubinage, which is more loosely defined (it requires either keeping the mistress in the family home, or cohabiting with her, or having sexual relations under scandalous circumstances). 
A breach of this expectation of fidelity is commonly referred to as adultery or extramarital sex. Historically, adultery has been considered a serious offense, sometimes a crime. Even if that is not so, it may still have legal consequences, particularly a divorce. Adultery may be a factor to consider in a property settlement, it may affect the status of children, the custody of children, etc.