Men with lower voices have higher levels of testosterone, ergo our lady caveman minds are more attracted to their virility. But! Conundrum! More virile men are also more desired by other women, and more likely to cheat on you based on the fact that they have more options, because those other ladies can't stop throwing themselves at your sexy, deep voiced partner.
Therefore, using logic, we can conclude that dating Isaac Hayes would have been a nightmare.
It's been a long time since I've taken a science class.
Deep Voices Trigger Infidelity Jitters [USA Today]