Their finding is based on a group of hunter-gatherers in Tanzania known as the Hadza, who can be studied without bias because they use no birth control.
Males who hit lower notes as they talked had about two more children on average than squeaky speakers.
It fits with observations that women find masculine voices more attractive, the team reports in Biology Letters.
i'm deep - but i will never let myself have any kids of my own. ever. so i guess i'm in the minority.