A marriage in which both spouses agree ahead of time to accept sexual relations by either partner with others is sometimes referred to as an open marriage or the swinging lifestyle.
Though what sexual activities constitute adultery varies, as well as the social, religious, and legal consequences, the concept exists in many cultures and is similar in Christianity, Islam, and Judaism.
A single act of sexual intercourse is generally sufficient to constitute adultery, and a more long-term sexual relationship is sometimes referred to as an affair.
and to expose him to support and provide for another man's [children]".
Thus, the "purity" of the children of a marriage is corrupted, and the inheritance is altered.
In the traditional English common law, adultery was a felony.
Although the legal definition of adultery differs in nearly every legal system, the common theme is sexual relations outside of marriage, in one form or another.
Historically, many cultures have considered adultery to be a very serious crime.
Adultery often incurred severe punishment, usually for the woman and sometimes for the man, with penalties including capital punishment, mutilation, or torture.
Traditionally, many cultures, particularly Latin American ones, had strong double standards regarding male and female adultery, with the latter being seen as a much more serious violation.
Adultery involving a married woman and a man other than her husband was considered a very serious crime.
Swinging and open marriages are both a form of non-monogamy, and the spouses would not view the sexual relations as objectionable.