The sound of a man’s voice conveys a lot of information; especially, about the amount of testosterone he produces. During puberty, men who produce more testosterone develop lower-pitched voices, which carry on throughout adulthood. The pitch of a man’s voice not only signals his level of testosterone, but behaviors associated with higher levels of testosterone: a higher sex drive and an inclination to commit infidelity.

While women are attracted to men with lower-pitched voices, they also seem to be aware of the risks of picking a long-term partner who is more likely to cheat. As such, women are more likely to be attracted to men with lower-pitched voices when selecting a short-term mate, but have reservations about selecting such men when it comes to settling down. As noted by the authors of the study:

“… women may generally perceive men with relatively masculine traits as sexually attractive, but less suitable as long-term mates.”

Dating is always more complicated then people realize. A host of factors weigh into our decision-making… mostly outside of our conscious awareness.

Source: O’Connor, J. J., Pisanski, K., Tigue, C. C., Fraccaro, P. J., & Feinberg, D. R. (2014). Perceptions of infidelity risk predict women’s preferences for low male voice pitch in short-term over long-term relationship contexts. Personality and Individual differences, 56, 73-77.