Kamasutra 5.4.35

5.4.35

asaṃstutayor adṛṣṭākārayor api dūtīpratyayād iti vātsyāyanaḥ//

The followers of Babhravya on the other hand, affirm that even though they be personally unacquainted, but have shown each other signs of affection there is an occasion for the employment of a go-between. Gonikaputra asserts that a go-between should be employed, provided they are acquainted with each other, even though no signs of affection may have passed between them. Vatsyayana, however, lays it down that even though they may not be personally acquainted with each other and may not have shown each other any signs of affection, still they are both capable of placing confidence in a go-between.