The Ananga Ranga is an Indian sex manual written in the 15th century by Kalyana Malla. Building upon the Kama Sutra, the poet aimed to educate specifically at preventing the separation of a husband and wife.
"Men, it is true, marry for the sake of undisturbed congress, as well as for love and comfort, and often they obtain handsome and attractive wives. But they do not give them plenary contentment, nor do they themselves thoroughly enjoy their charms. The reason of which is, that they are purely ignorant of the Scripture of Cupid, the Kama Shastra; and, despising the difference between the several kinds of women, they regard them only in an animal point of view. Such men must be looked upon as foolish and unintelligent; and this book is composed with the object of preventing lives and loves being wasted in similar manner, and the benefits to be derived from its study "