We shifted away from fist and fang when we began playing games with symbols in the communal imagination. Accounts of how and why this happened can only be speculative and are debated hotly. Some believe that, after we came down from the trees, the threat from predators huddled us into protective groups. As living became denser, males found themselves with more rivals to fight off, so began shifting their mating strategy towards one of pair-bonding, in which they’d offer meat and protection to females in return for preferred sexual access.

