▁more ▁adult s ▁live ▁together , ▁all ▁considering ▁themselves ▁partners , ▁sharing ▁fin ances , ▁children , ▁and ▁household ▁respons ib ilities . ▁Group ▁marriage ▁is ▁considered ▁a ▁form ▁of ▁poly am ory . ▁The ▁term ▁does ▁not ▁refer ▁to ▁big amy ▁as ▁no ▁claim ▁to ▁being ▁married ▁in ▁formal ▁legal ▁terms ▁is ▁made . ▁ ▁The ▁concept ▁re enter ed ▁popular ▁conscious ness ▁in ▁ 1 9 7 4 ▁with ▁the ▁publication ▁of ▁Group ▁Mar riage : ▁a ▁study ▁of ▁contemporary ▁mult il ater al ▁marriage ▁by ▁Larry ▁Const antine ▁and ▁Joan ▁Const antine . ▁ ▁Classification ▁Depending ▁on ▁the ▁sexual ▁orient ations ▁of ▁the ▁individuals ▁involved , ▁all ▁adult s ▁in ▁the ▁group ▁marriage ▁may ▁be ▁sexual ▁partners ▁of ▁all ▁others ▁with ▁whom ▁they ▁are ▁compatible . ▁For ▁instance , ▁if ▁all ▁members ▁are ▁heter osex ual , ▁all ▁the ▁women ▁may ▁have ▁sexual ▁relationships ▁with ▁all ▁the ▁men . ▁If ▁members ▁are ▁bis ex ual ▁or ▁pan sex ual , ▁they ▁may ▁have ▁evol ved ▁sexual ▁relationships ▁with ▁either ▁sex . ▁ ▁Group ▁marriage ▁implies ▁a ▁strong ▁commit ment ▁to ▁be ▁" fa ith ful " ▁by ▁having ▁sex ▁only ▁within ▁the ▁group ▁and ▁int ending ▁to ▁remain ▁together ▁for ▁an ▁extended ▁period . ▁The ▁group ▁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 .