Kamasutra 1.3.14

1.3.14

ācāryās tu kanyānāṃ pravṛttapuruṣasaṃprayogā sahasaṃpravṛddhā dhātreyikā/ tathābhūtā vā niratyayasaṃbhāṣaṇā sakhī/ savayāś ca mātṛṣvasā/ visrabdhā tat sthānīyā vṛddhadāsī/ pūrvasaṃsṛṣṭā vā bhikṣukī/ svasā ca viśvāsaprayogāt//

A female, therefore, should learn the Kama Shastra, or at least a part of it, by studying its practice from some confidential friend. She should study alone in private the sixty-four practices that form a part of the Kama Shastra. Her teacher should be one of the following persons, viz., the daughter of a nurse brought up with her and already married, or a female friend who can be trusted in everything, or the sister of her mother (i.e., her aunt), or an old female servant, or a female beggar who may have formerly lived in the family, or her own sister, who can always be trusted.