Kamasutra 5.1.7

5.1.7

vyabhicārād ākṛti-lakṣaṇa-yogānām iṅgitākārābhyām eva pravṛttir boddhavyā yoṣita iti vātsyāyanaḥ.

Ancient authors say that a man should know the disposition, truthfulness, purity, and will of a young woman, as also the intensity, or weakness of her passions from the form of her body, and from her characteristic marks and signs. But Vatsyayana is of opinion that the forms of bodies, and the characteristic marks or signs are but erring tests of character, and that women should be judged by their conduct, by the outward expression of their thoughts, and by the movements of their bodies.