There are cases where you could infer the artist's sex from their style (the fujoshi Bishounen style, the macho thick line style, the Tumblrite psuedo-anime style), even though both sexes now experiment with styles not typical of their sex. But there are women that draw women sexy, whether it's because that's what they want to be, have an... interest in such women, or just taking their own appearance further. Conversely, there are men that draw cutesy styles.