Sociology A group of people, often but not always related by birth or marriage, who live together and practice joint control over the household and group property.

 A pleasant emotion of happiness arising from seeing one’s partner with another partner. Contrast wibble; See also compersion. Usage: Primarily British; less common outside the United Kingdom. [..]

 A form of polygyny where a man marries two or more women who are sisters.

 Colloquial A person who openly chooses to have multiple simultaneous sexual relationships in an ethical and responsible way, and who openly revels in that decision. See related responsible non-monoga [..]

 A book (Dossie Easton and Catherine A. Liszt, Greenery Press, 1998, ISBN 1890159018) which outlines a framework for responsible non-monogamy and champions taking joy in ethical, safe promiscuity. Com [..]

 Colloquial A person who practices polyamory in a way that tends to separate or isolate all of his or her romantic relationships from one another, treating each as a separate entity. A free agent ofte [..]

 See BDSM: «PANSEXUAL».

 Colloquial Of or related to two (or more) couples or groups having sex in the same room, without members from one couple or group having sexual contact with members of another couple or group. Usage: [..]

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 The belief or philosophy that it is possible to love more than one person at the same time.