clipped from www.livescience.com

Previous studies conducted by David Feinberg of McMaster University in Canada have shown that women are more attracted to men with deeper voices, judging them to be older, healthier and more masculine than their higher-pitched rivals.

Men, on the other hand, go for women with higher pitched voices because they find them more attractive, subordinate, feminine, healthier and younger-sounding.

"While we find in this new study that voice pitch is not related to offspring mortality rates," Feinberg said, "we find that men with low voice pitch have higher reproductive success and more children born to them."

the researchers studied the Hadza tribe of Tanzania, one of the last true hunter-gatherer cultures. Because the Hadza have no modern birth control, the researchers were able to compare birth rates without any outside influencing factors.

They found that Hadza men with deeper voices had more children than those with higher voices.