wife swapping
noun [ U ] uk/ˈwaɪf ˌswɒp.ɪŋ/ us/ˈwaɪf ˌswɑː.pɪŋ/
换妻(两对结婚的夫妻和对方的配偶发生性关系)
an activity in which two sets of married people decide to have sex with each other's partners
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