Polyfidelity is a form of polyamorous group marriage wherein all members consider each other to be primary partners and agree to be sexual only with other members of this group. This term originated within the Kerista Village commune in San Francisco which practiced polyfidelity from 1971–1991. Kerista also expected all members of a polyfaithful group to be sexual with all other members (within bounds of their sexual orientations), but this aspect of polyfidelity is not always expected today.