Physical touch, in general, can release hormones that make us feel calm or happy. Despite this, however, it’s not universal for people, either by culture or as individuals, to see kissing as an intimate, or even typical, act. There are actually cultures that don’t engage in intimate kissing, some aspect of it really is just social and the fact that we normalized it as being an intimate act in the West at some point
Edit: should say that I’m operating off of some pretty foggy memories here, so take it with a grain of salt
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