电影[Following advicefromh ertherapi st, ayoungw omanand herhusb andtrytospiceu ptheirflagg ingmarriagebyt akingpartin somekinkybondag egames. Meanwhi le, thewoman� 39;ssister, acop, ishot onthetrail ofaserialkill erwithapencha ntforblindfold sandhand cuffs.Coul dthetwobe related?]！