In men, testosterone is one place where researchers look for these kind of signals. The hormone hinders the immune system, the study notes, but men with higher levels tend to have higher status in their society and are seen by women as more attractive mates. Both men and women equally saw the women with the higher-pitched voices as more attractive and more likely to be cheaters. But women saw men with deep voices as more likely to be cheaters, at "significantly higher rates," than men did, offering some support for the idea of an evolutionary warning sign of infidelity in vocal pitch.
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