Forbidden relationships in Judaism


Forbidden relationships in Judaism are those intimate relationships which are forbidden by prohibitions in the Torah and also by rabbinical injunctions.
Some of these prohibitions—those listed in Leviticus 18, known as arayot —are considered such a serious transgression of Jewish law that one must give up one's life rather than transgress one of them. This is as opposed to most other prohibitions, in which one is generally required to transgress the commandment when a life is on the line.
Some of these prohibitions, while still observed by Orthodox Jews, are currently observed to a lesser extent or not at all by some of the non-Orthodox movements.

Adultery

is prohibited by the seventh of the Ten Commandments which says simply:
It is forbidden for a man to have sexual relations with a married woman not his wife.

Niddah

A man is not allowed to have sexual relations with a woman—including his wife—during and after her menstrual period, until after she immerses in a mikveh. A woman who has experienced her menstrual period and has not gone to a proper mikveh is referred to as niddah.

Religious intermarriage

Religious intermarriage is forbidden in Judaism. There are differing opinions among the rabbis as to when the prohibition on sexual relations with non-Jews is from the Torah, and when it is rabbinic.

Incest

Biblical prohibitions

Sexual relations with certain close relatives are forbidden in the Hebrew Bible. Though they are generally called incestuous relations, the biblical list does not necessarily correspond to those prohibited under state laws. In the Hebrew Bible, sexual relationships between siblings are forbidden to Jews but permissible to Gentiles.
The relationships forbidden by Leviticus 18 are:
In addition to the relationships biblically prohibited to Jews, rabbis have gone further to prohibit additional relationships with various blood relatives or in-laws. These are called "Shni'ot". Some of these are:
Adopted children who are raised together are not permitted to marry because of appearances, even if they are not biologically related.

Exclusions from the assembly

The Bible excludes certain categories of people from taking part in the qahal of Hashem. Jewish tradition considers this to be solely a limitation on marriage.

Biblical peoples

A Jew is prohibited from marrying a male Moabite and Ammonite convert ; or an Egyptian or Edomite convert up to the third generation from conversion.
Nethinim/Gibeonites are prohibited by rabbinic injunction.
As the people currently living in those areas may not be descended from the original peoples, these prohibitions may not apply today.

Mamzer

A mamzer in Jewish law is a child resulting from an incestuous liaison or an adulterous liaison by a married woman. As a mamzer is excluded from the assembly, the Talmud forbids a marriage by an ordinary Jew to a mamzer. However, a mamzer may marry a convert or another mamzer, though their child would also be considered a mamzer.

Certain eunuchs

Jewish tradition also forbids marriage to a man who has been forcibly emasculated; the Greek term spadon which is used to refer to such people, is used in the Septuagint to denote certain foreign political officials. The Jewish prohibition does not include men who were born without visible testicles, or without a visible penis. There is dispute, even in traditional Judaism, about whether this prohibited group of men should include those who have become, at some point since their birth, emasculated as the result of a disease.

Special rules for priests

are not allowed to marry:
Some of these prohibitions are biblical, and some are rabbinical.
The Kohen Gadol must also not marry a widow. Sexual relations with a widow are also forbidden. He is required to marry a virgin maiden. However, if he was married to a woman otherwise permitted to a kohen, and was then elevated to the high priesthood, he may remain married to her.

Homosexuality and bisexuality

Orthodox view

interprets as forbidding men from lying with other men in the manner in which they would with a woman, and calls it an abomination.
There are three reasons rabbis give for men lying with other men being prohibited in Jewish law:
  1. It is a defiance of gender anatomy, which is unlike God's intention of procreation and sexual activity
  2. The sexual arousal involved results in a vain emission of semen
  3. It may lead a man to abandon his family
There is no prohibition in the Torah against sexual intercourse between two women, but rabbinic law has prohibited it as an extension of the "activities of Egypt". However, it is not considered adultery, and does not prohibit the woman to a kohen.

Conservative view

's Committee on Jewish Law and Standards has validated different approaches to homosexuality and bisexuality, with one opinion being like the Orthodox position in many respects, and another opinion permitting many forms of homosexual sex and relationships, while continuing to regard anal intercourse between men as prohibited.
In 2012, the American branch of Conservative Judaism devised a commitment ceremony for same-sex couples, though not defined as kiddushin. In 2016, the rabbis of the American branch of Conservative Judaism passed a resolution supporting transgender rights.

Humanistic Judaism

In 2004, the Society for Humanistic Judaism issued a resolution supporting "the legal recognition of marriage and divorce between adults of the same sex", and affirming "the value of marriage between any two committed adults with the sense of obligations, responsibilities, and consequences thereof".

Reform view

interprets Leviticus 18:22 as forbidding men from using sex as a form of ownership over men. Reform Jewish authors have revisited the Leviticus text, and ask why the text mentions that one should not lie with a man "as with a woman". If it is to be assumed that the Torah does not waste words, the authors ask why the Torah includes this extra clause. Most Reform Jews suggest that since intercourse involved possession, similar to the Christian theology of using sex to "consummate" a marriage, it was abhorrent that a man might acquire another man—it is not the act of homosexual intercourse itself which is abhorrent, but using this act to acquire another man and therefore confuse the gender boundary.

Bestiality

Men and women are forbidden from engaging in bestiality. It is considered an abomination according to the Torah.

Youth

Rather than being seen as merely a literary device to quickly describe the populating of the earth, the biblical instruction to go forth and multiply was interpreted by the classical rabbis to mean that it was the duty of every male Jew to marry as soon as possible. Several Talmudic rabbis urged that children should be married as soon as they had reached the average age of puberty, which was deemed to occur at 14 years of age; however, it was also strictly forbidden, by classical rabbinical literature, for parents to allow their children to marry before the children had reached this age. Despite the young threshold for marriage, marriages with a large age gap between the spouses were thoroughly opposed by the classical rabbis
The classical rabbis saw 18 as the ideal age to become married, and anyone unmarried after the age of twenty was said to have been cursed by God; rabbinical courts frequently tried to compel an individual to marry, if they had passed the age of twenty without marriage. Nevertheless, the classical rabbis viewed study of the Torah as a valid reason for remaining unmarried, although they were only rarely willing to regard life-long celibacy favourably. Since the classical rabbis viewed marriage as a duty deriving from the instruction to go forth and multiply, they also believed that the duty to marry ended once the husband had fathered both a son and a daughter; despite this, they also argued that no man should live without a wife even after he has several children.

Ability to give consent

Children, however, were not regarded as old enough to make an informed decision, and so could not consent to marriage themselves, although marriage to a female child was still permissible if her father consented, whether she agreed to it or not; if the father was dead, such consent could be given by her mother, or her brothers, but in this latter case, the girl could annul the marriage when she reached the "standard" age of puberty, if she wished.
The mentally handicapped, and deaf-mutes, were also regarded, by traditional Jewish law, as being unable to give their consent; indeed, marriage to such people was forbidden. However, the rabbis allowed deaf-mutes to marry each other.