在回答这个问题之前，先让我们了解一个概念：情感触摸（affective touch）。

“情感触摸”通常用来描述缓慢移动的、低力量的、令人愉悦的机械刺激，也就是人类之间常见的贴贴和爱抚。日常生活中，人们常用这种形式来表达爱、关心、欣赏等感情。

在人类的感觉系统中，情感触摸由一类特定的感受器（c-触觉传入，简称CT）传导，主要皮质靶点在后脑岛。功能核磁共振成像研究辨明，情感触摸能够在侧后脑岛和高级区域（比如眼眶前额皮质）引起反应，传递身体情感、生理状态等信息，形成内感觉模式。

研究标明，令人愉♂悦的最佳抚摸速度为1-10cm/s，当速度达到3cm/s是CT传导效果可达到峰值。慢了或快了都没这个效果好。

感兴趣的朋友可以自行实践一下，嗯嗯。

英文中的“bridal carry（新娘抱）”描述的姿势与公主抱类似，但一般仅用于新婚夫妇之间。不过，这个婚礼习俗的起源与“幸福”、“浪漫”无关，反而充斥着掠夺与奴役：

罗马帝国建国之初，女性非常少，于是罗马人便邀请附近的萨比尼人参加节日庆典，并把他们灌醉，然后在宴会上挑起争斗，把妇女打横抱起，掳掠到自己家。

现如今的“公主抱”已经只余形式。可能因为，这个世界喜欢所谓“浪漫”的东西。或是说，喜欢把不方便言说的东西藏起来，然后留下“浪漫”的东西。

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