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休闲性行为（英语：Casual sex），或称随意性行为、非正式性行为、无负担性行为，是发生在浪漫关系外的合意性活动，意味着性伴侣之间没有承诺、情感依恋或熟悉的关系[1][2]。休闲性行为包括休闲约会、一夜情、性交易及交换配偶等。
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