A kiss should be sonorous. Its sound, light and prolonged, takes its rise between the tongue and the moist edge of the palate. It is produced by a movement of the tongue in the mouth and a displacement of the saliva provoked by suction. A kiss given on the outside of the lips and accompanied with a sound like that made when calling a cat, gives no pleasure whatever. Such a kiss is meant for children, or the hands. The kiss I have described above, and, which belongs to copulation, provokes a delicious voluptuousness. It is for you to learn the difference. 

~ The Perfumed Garden, translated into English by Sir Richard Burton, 1886