Kamasutra 1.5.27

1.5.27

bhinnatvāt tṛtīyā prakṛtiḥ pañcamīty eke//

But these four latter kinds of Nayikas do not differ much from the first four kinds of them, as there is no separate object in resorting to them. Therefore, Vatsyayana is of opinion that there are only four kinds of Nayikas, i. e., the maid, the twice-married woman, the public woman, and the woman resorted to for a special purpose.