A recent study from McMaster University has revealed the connection between pitch of the voice, hormones and tendency to cheat on partners.

The study published in the online journal Evolutionary Psychology, shows a link between hormones, pitch and the tendency to cheat. Men with high testosterone levels usually speak in a lower pitch, and the high hormonal levels could be causing them to be disloyal to their partners. Similarly, women with high estrogen levels speak in a higher pitch and portray a strong tendency towards infidelity.
Source-Medindia