親吻行為源自2150萬年前？人類與黑猩猩共同祖先早已為之

親吻並非人類獨有的親密行為，最新研究顯示，早在2150萬年前，靈長類祖先已出現口部接觸的互動模式。

跨物種行為具共性​

英國牛津大學演化生物學家布林德爾博士領導的研究指出，親吻可能源自人類與類人猿的共同祖先，且已滅絕的尼安德塔人，他們不僅彼此親吻，甚至可能與現代人類有過唾液交換。

研究團隊將親吻定義為「非攻擊性、具唇部或口部接觸、不涉及食物交換」的行為，並據此分析動物紀錄，發現黑猩猩、倭黑猩猩與人類均具此行為，推測其共同祖先於2150萬年前已具備親吻能力。此外，狼、土撥鼠、北極熊與信天翁等物種中，也存在符合定義的類似互動。

親吻或為健康評估

雖然親吻無直接生存優勢，但跨物種的普遍性顯示其可能具社會功能或健康評估作用。研究發現現代人與尼安德塔人唾液中有相同細菌，暗示雙方曾有密切接觸。科學家推測，親吻可能源自靈長類理毛行為，或作為判斷伴侶健康與基因相容性的方式。

科學家推測，親吻可能源自靈長類理毛行為。資料圖片

親吻超越浪漫框架​

布林德爾博士強調，親吻不應僅被視為浪漫象徵，而是人與動物共通的社會互動現象，值得深入探討其演化意義與生物學基礎。

親吻是人與動物共通的社會互動現象。資料圖片

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