Kamasutra 5.2.2

5.2.2

sarvatra śaktiviṣaye svayaṃ sādhanam upapannatarakaṃ durupapādatvāt tasya dūtīprayoga iti vātsyāyanaḥ//

Ancient authors are of opinion that girls are not so easily seduced by employing female messengers as by the efforts of the man himself, but that the wives of others are more easily got at by the aid of female messengers than by the personal efforts of the man. But Vatsyayana lays it down that whenever it is possible a man should always act himself in these matters, and it is only when such is impracticable, or impossible, that female messengers should be employed. As for the saying that women who act and talk boldly and freely are to be won by the personal efforts of the man, and that women who do not possses those qualities are to be got at by female messengers, it is only a matter of talk.