Part 4: Women see a broad chest and shoulders as a sign of someone who can clobber a steady supply of meat and keep lions away from the cave. In addition, while a hairy chest and a full beard have fallen out of favor in the waxed and buffed 21st century, they are historically if unconsciously seen as signs of healthy testosterone flow that gives rise to both fertility and strength.
A deep voice, also testosterone driven, can have similarly seductive power. Psychology professor David Feinberg of McMaster University in Ontario studies Tanzania’s Hadza tribesmen, one of the worlds last hunter-gather c...