Yes I know about serotonin etc, but why does the stimulus of petting a fluffy critter evoke that response in the first place?
My personal uninformed armchair theory: We’re apes, and apes pick bugs out of each other’s fur to bond as a group. But when our ancestors forsook the trees for the plains, we shed our fur to gained sweat glands in order to become the ultimate persistence hunters. Yet the urge to groom remains. We have no fur and we must pet.


I’m sure alien species with more intelligence, strength and ability than us might do the same with us if they landed on our planet.
“I’m a person and I have personal space!” --me if this ever happens.
I’d cuddle with an alien, sounds dope
Then when you ‘come of age’ … you get entered into the Human fights where aliens get to bet on winners and losers.
That sounds less dope