If you have your sights set on a big family, a man with a deep voice might be the ideal partner, a new study has revealed.
It is also thought that reproductive-minded women favour men with low-pitched voices when choosing a mate.
The researchers linked low voices to associations with dominance, being older, healthier and more masculine.
Men, meanwhile, find women with high voices more attractive, subordinate, feminine and younger sounding.
This points to an explanation of why men and women have different voices.
David Feinberg, a professor at McMaster University where the research was conducted, said: "While we find this new study that voice pitch is not related to offspring mortality rates, we find that men with low voice pitch have higher reproductive success and more children born to them.
"If our ancestors went through a similar process, this could be one of the reasons why men's and women's voices sound different."