Skandapurana 5.212.33

5.212.33

naivaṃvidhaṃ rataṃ veda anayā yadvinirmitam ..
veśyā api na jānaṃti ratamīdṛkkathañcana .. 33 ..

does not know such lovemaking as has been performed by this woman! / Even courtesans do not know of such lovemaking by any means.”