Kamasutra 6.5.34

6.5.34

āyaty arthinī tu tam āśritya cānarthaṃ praticikīrṣantī naiva 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.