The deep timbre of a male voice may sound attractive, but low-voiced men actually tend to have lower sperm counts, a 2012 study said.⁠ ⁠ Multiple studies have found that women usually favor masculine features, such as prominent jaws, high muscle mass, and low-pitched voices.⁠ The theory is that these traits signal a high-quality mate—for instance, it's been proposed that masculine men generally have more robust amounts of sperm.⁠ But the research revealed that, while deep voices are attractive to women, low-pitched men actually tended to have lower concentrations of sperm in their ejaculate.⁠ ⁠ The finding suggests that men who evolutionarily invest most of their energy into making themselves attractive to females may suffer deficiencies in other areas—in this case, sperm counts.⁠ For instance, the male hormone testosterone—which lowers voice pitch—can thwart sperm production, according to study leader Leigh Simmons, an evolutionary biologist at the University of Western Australia.⁠ ⁠ ...