None of the conservative sects of the Big Three encourage their adhereants to practice polyamory, in part because it allows Christianity At the most sex-negative end of the scale, some conservative forms of Christianity strictly prohibit sexuality for pleasure and mandate stark boundaries that confine sexuality to married heterosexuals who are trying to have children. Even though "The Book" (Torah/Old Testament) is filled with multiple-partner marriage, contemporary conservative forms of Christianity are stridently against non- or extra-marital sexuality (again, even though some of their most famous preachers have been caught in extramarital sexual relationships).

A form of active meditation, the goal of Tantric sex is to allow participants to fully inhabit all parts of their own beings and recognize the divine in each other.

While Tantra tends to emphasize heterosexual sex between two people, its sex-positivity and celebration of intimacy means that it is generally open to polyamorous relationships (at least in the US).

The non-monogamous past does not translate to contemporary acceptance, though, and in general most Christian sects are not known for their embrace of sexual diversity.

Some contemporary Christian-influenced non-monogamous groups practice polygyny, but explicitly reject polyamory becuase it allows women additional partners as well.

For these Christians and fundamentalist members of the Church of the Latter Day Saints (FLDS or Fundamentalist Mormon), women are not supposed to have sex with any man other than her husband (of which she is allowed only one) and are not supposed to have sex with their husband's other wives—her "sisterwives"—either.

Islam Generally Islamic beliefs are open to non-monogamous relationships, but only polygyny is acceptable.

Judaism Judaism sees sexuality between married people as a mitzvah: a positive thing that varies from following a divine commandment to doing a good deed.

This fundamentally optimistic view of sexuality differs markedly from the sex-negative view of conservative Christianity, and is much closer to Islamic beliefs that cast sexuality as an important part of sustaining companionship in a marital relationship, even beyond its function in childbearing.

Quodoushka is a decidedly Western and recent amalgamation of Native American spiritual tenets combined to create a practice aimed to heal shame and allow spiritual seekers to experience the fullness of their intimate connections, though some critics dispute its reputed spiritual roots and see it rather as a money-making scheme.