Kamasutra 5.6.19

5.6.19

yatra saṃpāto 'syās tatra citrakarmaṇas tad yuktasya vyarthānāṃ gītavastukānāṃ krīḍanakānāṃ kṛtacihnānām āpīnakānā(kasya)m aṅgulīyakasya ca nidhānam/

When a go-between has no access to the harem, then the man should stand in some place where the lady, whom he loves, and whom he is anxious to enjoy, can be seen. If that place is occupied by the King's sentinels, he should then disguise himself as a female attendant of the lady who comes to the place, or passes by it. When she looks at him he should let her know his feelings by outward signs and gestures, and should show her pictures, things with double meanings, chaplets of flowers, and rings. He should carefully mark the answer she gives, whether by word or by sign, or by gesture, and should then try and get into the harem. If he is certain of her coming to some particular place, he should conceal himself there, and at the appointed time should enter along with her as one of the guards. He may also go in and out, concealed in a folded bed, or bed covering, or with his body made invisible, by means of external applications, a receipt for one of which is as follows: