Kamasutra 6.5.4

6.5.4

dvis triś catur iti lābhātiśayagrahārtham ekasyāpi gacchet/ parigrahaṃ ca caret//

When a courtezan is able to realize much money every day, by reason of many customers, she should not confine herself to a single lover; under such circumstances, she should fix her rate for one night, after considering the place, the season, and the condition of the people, also having regard to her own good qualities and good looks, and after comparing her rates with those of other courtezans. She can inform her lovers, and friends, and acquaintances about these changes. If, however, she can obtain a great gain from a single lover, she may resort to him alone, and live with him like a wife.