Kamasutra 5.6.3

5.6.3

puruṣapratimā avyaktaliṅgāś cādhiśayīran//

The women of the royal harem cannot see or meet any men on account of their being strictly guarded, neither do they have their desires satisfied, because their only husband is common to many wives. For this reason among themselves they give pleasure to each other in various ways as now described. Having dressed the daughters of their nurses, or their female friends, or their female attendants, like men, they accomplish their object by means of bulbs, roots, and fruits having the form of the lingam, or they lie down upon the statue of the male figure, in which the lingam is visible and erect.