What makes someone sound sexy? To get a scientific (viewpoint), researchers gauged volunteers' responses to different voices. The conclusion: voices considered attractive send messages about body size. The work is in the journal PLoS ONE. [Yi Xu et al., Human Vocal Attractiveness as Signaled by Body Size Projection]
In the animal kingdom, sound indicates size and intentions. For example, a rough and low-frequency call suggests the vocalizer is large and (aggressive), while a clearer, higher frequency signals a small, nonthreatening animal.
In the study, researchers adjusted a variety of voices to correspond with different body sizes. To do so, they synthesized completely artificial voices, and recorded sentences before varying the pitches and resonance.
When volunteers listened to the sound (samples), men preferred higher-pitched female voices like this one [voice clip], which suggest a smaller body size. Low-frequency male voices that signaled a large body size [voice clip], were attractive to females.
Interestingly, breathiness made both male and (female) voices more desirable. It certainly explains the enduring popularity of
