Are you asking what was the evolutionary pressure for holding hands, or what is the mechanism that causes holding hands to feel good?
For the evolutionary reason, we can only speculate, but it promotes physical closeness which as with a parent and a child, usually means protection and survival.
For the mechanism, that physical touch causes the release of oxytocin, also known as the “love hormone”. This elevates your mood and makes you feel bonded to the person you are with.
Latest Answers