al ) ▁poly and ry ". ▁The ▁pir ra uru ▁" relation ▁ar ises ▁through ▁the ▁exchange ▁by ▁brothers ▁of ▁their ▁w ives ". ▁Among ▁the ▁K urn and ab uri ▁of ▁Australia , ▁" a ▁group ▁of ▁men ▁who ▁are ▁own ▁or ▁trib al ▁brothers ▁are ▁un ited ▁… ▁in ▁group ▁marriage ". ▁Among ▁the ▁W ak el b ura ▁of ▁Australia , ▁there ▁is ▁" adel ph ic ▁poly and ry ." ▁Among ▁the ▁K urn ai ▁of ▁Australia , ▁" un mar ried ▁men ▁have ▁access ▁to ▁their ▁brothers ' ▁w ives ." ▁ ▁In ▁modern ▁U . S . ▁practices ▁ ▁Group ▁marriage ▁occasionally ▁occurred ▁in ▁commun al ▁soci eties ▁founded ▁in ▁the ▁ 1 9 th ▁and ▁ 2 0 th ▁centuries . ▁ ▁A ▁long - l ived ▁example ▁was ▁the ▁One ida ▁Community ▁founded ▁by ▁John ▁Hum ph rey ▁No yes ▁in ▁ 1 8 4 8 . ▁ ▁No yes ▁taught ▁that ▁he ▁and ▁his ▁follow ers , ▁having ▁reached ▁ 2 0 0 ▁in ▁number , ▁had ▁thus ▁under g one ▁san ct ification ; ▁that ▁is , ▁it ▁was ▁impossible ▁for ▁them ▁to ▁sin , ▁and ▁that ▁for ▁the ▁san ct ified , ▁marriage ▁( al ong ▁with ▁private ▁property ) ▁was ▁abol ished ▁as ▁an ▁expression ▁of ▁je alous y ▁and ▁exclus iveness . ▁The ▁One ida ▁commune ▁lived ▁together ▁as ▁a ▁single ▁large ▁group ▁and ▁shared ▁parent al ▁respons ib ilities . ▁Any ▁given ▁male - f em ale ▁combination ▁in