休閒性行為(英語:Casual sex),或稱隨意性行爲、非正式性行爲、無負擔性行爲,是發生在浪漫關係外的合意性活動,意味着性伴侶之間沒有承諾、情感依戀或熟悉的關係[1][2]。休閒性行為包括休閒約會、一夜情、性交易及交換配偶等。
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