Kamasutra 5.4.59

5.4.59

tasyās tayaiva pratyuttarāṇi yojayet//

(5) A woman, who has gained the confidence of the innocent young wife of any man, and who has learned her secrets without exercising any pressure on her mind, and found out from her how her husband behaves to her, if this woman then teaches her the art of securing his favor, and decorates her so as to show her love, and instructs her how and when to be angry, or to pretend to be so, and then, having herself made marks of the nails and teeth on the body of the wife, gets the latter to send for her husband to show these marks to him, and thus excite him for enjoyment, such is called the go-between of an innocent young woman. In such cases the man should send replies to his wife through the same woman.