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Group marriage (a form of polyamory) is a marriage-like arrangement between more than two people. Usually consisting of three to six adults, all partners live together, share finances, children, and household responsibilities. ==Classification== Depending on the sexual orientation and activity of the members, all adults in the family may be sexual partners. For instance, if all members are heterosexual, all the women may have sexual relationships with all the men. If the members are bisexual, they may have sexual relationships with the women as well as the men. Group marriage implies a strong commitment to be faithful - by only having sex within the group and staying together long term. Family members may be open to taking on new partners, but only if all members of the family agree to accept the new person as a partner. The new person then moves into the household and becomes an equal member of the family. Currently, the most common form of group marriage is a triad of two women and one man, or two men and one woman.〔http://www.cat-and-dragon.com/stef/poly/Labriola/open.html〕 However, there have recently been a number of polyfidelitous families formed by two heterosexual couples who become a four-some and live together as a family. Line marriage is a form of ''group marriage'' found in fiction in which the family unit continues to add new spouses of both sexes over time so that the marriage does not end.〔Heinlein, 1966, pp. 260–262.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Group marriage」の詳細全文を読む スポンサード リンク
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