It seems like many mammals even those that would be considered exotic or dangerous seem to enjoy being petted by humans under the right circumstances. Why did so many mammals evolve to enjoy this?
In: Biology
We are from the same evolutionary node. We have very similar nerve endings / pressure receptors. Push just hard enough, and it releases endorphins – both in us, and in other mammals. Same with scratching. They just feel it the same way we do. It’s comfortable.
Then you could optionally stack up oxytocin from the bonding/social element and other factors that I am not educated enough to know about.
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