Sex Differences
Men and women have different vocal fold sizes. Adult male voices are usually lower pitched and have larger folds. The male vocal folds are between 17.5 mm and 25 mm (approx 0.75" to 1.0") in length.
The female vocal folds are between 12.5 mm and 17.5 mm (approx 0.5" to 0.75") in length.
Folds are pearly white in color - more white in women than in men.
The difference in vocal fold size between men and women causes a difference in vocal pitch. Additionally, genetic factors cause variations between members of the same sex, with men's and women's voices being categorized into types.
Read more about this topic: Vocal Folds
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