Some physiologists are adamant in their assertion that women can't build muscle mass without testosterone levels greatly in excess of normal. That's why, with female bodybuilders, you often see the signs of high testosterone levels: no body fat, dysfunction of sex organs, atrophy of breast tissue and excessive bone growth. The latter is most evident in the jawbone and skull, which give a prognathous appearance to the face, much like the Guberbator in his "Mr. Universe" days.