How does each sculptor establish the gender of his figure? Does Rodin achieve more in terms of gender identity by leaving some of the original marble unfinished?

Compare Michelangelo’s “David” (Figure 5-8) with Rodin’s “Danaïde” (Figure 5-9). How does each sculptor establish the gender of his figure? Does Rodin achieve more in terms of gender identity by leaving some of the original marble unfinished?