Kamasutra 5.6.43

5.6.43

paravākyābhidhāyinībhiś ca gūḍhākārābhiḥ pramadābhir ātmadārān upadadhyāc chaucāśaucaparijñānārtham iti bābhravīyāḥ/

The followers of Babhravya say that a man should cause his wife to associate with a young woman who would tell him the secrets of other people, and thus find out from her about his wife's chastity. But Vatsyayana says, that as wicked persons are always successful with women, a man should not cause his innocent wife to be corrupted by bringing her into the company of a deceitful woman.