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                    人類的嘴唇天生就適合接吻嗎?

                    作者: 17know 分類: 情感 發布時間: 2017-02-17
                      荷蘭的科學家們報道過,在熱吻10秒的過程中,接吻雙方會交換約8000萬個細菌。這個發現讓人不禁對撅起的雙唇敬而遠之——特別是感冒和流感季節,這個結果會讓人覺得接吻徹頭徹尾的不衛生。
                      不過不用擔心:和接吻相比,我們更可能因為日常握手而生病。接吻背后的科學原理表明,除了交換細菌,我們也還是能通過接吻和伴侶交換許多好處。
                      接吻并不只事關細菌交換或者愛情。我們對愛意和安全感的初體驗往往與唇部的觸壓和刺激有關,而這些感覺來自諸如哺乳類與接吻相仿的行為。這些幼年經歷讓寶寶的大腦形成重要的神經通路,將親吻與正面情緒聯系起來。這些正面情緒在接下來的生活中將繼續扮演重要角色。
                      我們的嘴唇是身上最裸露的性感帶(erogenous zone)。和其它動物不一樣,人類的嘴唇尤其外翻。它們充滿了敏感的神經末梢,即使最輕微的觸碰都會向我們的大腦傳輸一大波信息——感覺好極了。
                      親吻激活了大腦中很大一片和感覺信息相關的區域,因為我們要借此更好地感知這些經歷,從而決定接下來怎么做。吻的神奇之處在于它能使我們的身體旋風般地釋放一連串神經遞質和激素,影響我們的思維和感覺。
                    人類的嘴唇天生就適合接吻嗎?
                      如果說兩個人之間確實有“化學反應”,那么吻則能夠為一段關系起始新的反應階段。一番熱吻意味著兩人靠得非常近——輕偎低傍,耳鬢廝磨。我們用嗅覺、味覺和觸覺感知著對方,我們所感知到的各種信息都被送至大腦,充實我們對彼此的了解。事實上,有研究表明男性能通過氣味能關于自己DNA的信息不知不覺地傳達給伴侶。
                      紐約州立大學奧爾巴尼分校(State University of New York at Albany)的演化心理學家們發現,有59%的男性和66%的女性稱自己曾因一個不如人意的吻而終止了曖昧的發展。吻是自然的終極試金石,鼓動我們被遺傳上最般配的伴侶所吸引。瑞士科學家克勞斯·韋德金德(Claus Wedekind)的一項研究則發現,一個女性最心動的男性,編碼主要組織相容性復合體(major histocompatibility complex,MHC)的DNA區域往往與自己最不相同。這一復合體在免疫系統中發揮作用。
                      科學家們猜想,當一對伴侶用于抗擊疾病的遺傳信息截然不同時,他們的孩子將更加有可能擁有一個更強的免疫系統。我們在與人接吻時也許不會想到為人父母那一步,但親吻提供了線索,幫我們決定是否要深入發展。(不過值得一提的是,服用避孕藥的女性對男性氣味的喜好正好相反,那些MHC與自己更相近的男性反而更有勝算。這暗示著,在避孕時,我們欺騙自己身體的地方也許比我們想象中還多。)
                      牽一吻,動全身
                      除了能幫我們找到合適的伴侶,接吻還有其他妙處。它引發了腦與舌、唇、面部肌肉和皮膚之間的一連串神經沖動。數十億個神經連接將信息傳達到身體各處,產生出化學信號,改變我們的感覺。
                      一個熱吻能夠觸發神經遞質多巴胺的釋放——多巴胺與渴求和欲望的感覺相關聯。素有“愛情激素”之稱的催產素則促使我們產生親密感和依戀感。腎上腺素加快了心律,讓我們開始發汗,身體開始期待有“然后”。而“應激激素”皮質醇的水平下降,則減少了我們的不安。于是乎,接吻的人們血管舒張,呼吸加深,面頰緋紅,脈搏變快。
                      親吻加強了我們所謂“墮入愛河”的感覺。從這個角度說,一個吻或許能夠召喚出一段新的戀愛關系。它還能加固我們和親友之間的強烈情感紐帶。各種類型的吻出現在我們人生中最有意義、最重要的時刻中,讓我們得以溝通溢于言表的感受。
                      盡管親吻顯然對演化和個體而言都如此重要,科學還沒怎么開始研究它。不過,就我們已知的而言,接吻不僅僅是眼神交匯和唇齒相交而已。

                    如果覺得我的文章對您有用,請隨意打賞。您的支持將鼓勵我繼續創作!

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