In life there needs to be balance, a meeting of opposites. Hot, cold, black, white etc. You get the picture.
It is this search for balance, the inclusion of the opposite, that draws us to men with rough, gruff, deep voices, simply because many of us belonging to the fairer sex have higher-pitched sometimes squeaky voices. And while a deep voice is certainly not a requirement; it’s just another thing that makes us think of manliness and masculinity.