A new report published in Biology Letters suggests that the deeper a man’s voice, the more fertile he is. By collecting voice recordings of tribal men and women (ages 18–55) from Tanzania, researchers found that men with lower-pitched voices had more children than men with higher-pitched voices. Coren Apicella, a doctoral student who worked on the study admits that they cannot fully explain the difference but told the press, “Deep tones are suggestive of increased testosterone levels, which could lead females to perceive such men as better hunters and therefore better providers…or it could be that men with deeper voices simply start reproducing earlier.”

No word on whether deep voices were just plain sexier and more attractive to women.