The Kama Sutra of Vatsyayana

Kama is the enjoyment of appropriate objects by the five senses of hearing, feeling, seeing, tasting, and smelling, assisted by the mind together with the soul. The ingredient in this is a peculiar contact between the organ of sense and its object, and the consciousness of pleasure which arises from that contact is called Kama.

Kama is to be learnt from the Kama Sutra (aphorisms on love) and from the practice of citizens.