Kamasutra 6.1.17

6.1.17

rāgo bhayam arthaḥ saṃgharṣo vairaniryātanaṃ jijñāsā pakṣaḥ khedo gharmo yaśo 'nukampā suhṛd vākyaṃ hrīḥ priyasādṛśyaṃ dhanyatā rāgāpanayaḥ sājātyaṃ sāhaveśyaṃ sātatyam āyatiś ca gamanakāraṇāni bhavantīty ācāryāḥ/

Ancient authors are of opinion that the causes of a courtezan resorting to men are love, fear, money, pleasure, returning some act of enmity, curiosity, sorrow, constant intercourse, Dharma, celebrity, compassion, the desire of having a friend, shame, the likeness of the man to some beloved person, the search after good fortune, the getting rid of the love of somebody else, the being of the same class as the man with respect to sexual union, living in the same place, constancy, and poverty. But Vatsyayana decides that desire of wealth, freedom from misfortune, and love, are the only causes that affect the union of courtezans with men.