婚外性行為是指已婚人士與自己的配偶以外的人（無論對方是否已婚或單身）發生的性行為。如果婚外性行為不違反當地的性規範，則可以稱為自願性非單配偶制。如果婚外性關係違反了當地的性規範，則婚外性行為可能被稱為通姦。對已婚女性來說，婚外性行為的發生率會隨着婚姻持續時間而降低。[1]
參考文獻
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