Book X, 56

There is no manifest sign of chastity: this I tell husbands who are made fools of. Neither are ill-looks quite free from suspicion, nor is every pretty woman naturally vicious. For a woman may refuse to yield to those who are ready to pay a high price owing to her beauty, and we see many who are not good-looking never satisfied with amorous intercourse, and giving large presents to those who possess them. Nor if a woman is always frowning and is never seen to laugh, and avoids showing herself to men, is this behaviour a pledge of chastity. On the contrary, the most grave of them may turn out to be whores in secret, and the merry ones who are amiable to everyone may be virtuous, if any woman is entirely virtuous. Is age, then, a criterion? But not even old age has peace from the goad of Aphrodite. We trust then to oaths and her religious awe. But after her oath she can go and seek out twelve newer gods.