Kamasutra 6.5.33

6.5.33

gamyam anyato nivārayitukāmā saktam anyasyām apahartukāmā vā anyāṃ vā lābhato viyuyukṣamāṇāgamyasaṃsargād ātmanaḥ sthānaṃ vṛddhim āyatim abhigamyatāṃ ca manyamānā anarthapratīkāre vā sāhāyam enaṃ kārayitukāmā saktasya vā ^anyasya vyalīkārthinī pūrvopakāram akṛtam iva paśyantī kevala prīty arthinī vā kalyāṇabuddher alpam api lābhaṃ
pratigṛhṇīyāt//

When a courtezan wants to keep some particular man from some other woman; or wishes to get him away from some woman to whom he may be attached; or to deprive some woman of the gains realized by her from him; or if she thinks that she would raise her position; or enjoy some great good fortune; or become desirable to all men by uniting herself with this man; or if she wishes to get his assistance in averting some misfortune; or is really attached to him and loves him or wishes to injure somebody through his means; or has regard to some former favor conferred upon her by him; or wishes to be united with him merely from desire; for any of the above reasons, she should agree to take from him only a small sum of money in a friendly way.