Women often find deep-voiced men more attractive, but a new study says such men are not always better in one of the masculine traits: virility.

Researchers from the University of Western Australia found that though men with a lowpitched voice are considered more muscular and attractive , they don't have "macho" sperm.

The first finding of the researchers, who looked at male voice pitch, women's perceptions of it and semen quality, was no surprise: Women like low-pitched voices and consider them masculine.

But contrary to expectations , they also found that these men aren't better off in the semen department. In fact, by one measure of sperm quality - concentration - men with the deep voices appeared to have a disadvantage, LiveScience reported.