>>22258852The leading theory is that it is a holdover from when our ancestors used to headbutt each other into submission to win breeding rights.
The receding hairline giving men a more menacing appearance in that regard.
Like rutting in most social mammals.
Neanderthals didn't have those big eyebrows (literally called percussion brows) for nothing.
Womyn will open their legs for the only male who hasn't been knocked unconscious in a headbutting championship.
