The ants and the Kama Sutra
Vaughn Bryant, Professor of anthropology at the University of Texas, in their professional publications devoted to kissing, says that the first mention of the kiss dates back to 1000-2000 BC This was confirmed by excavations in the North of India, and it seems that kiss was a question of courtesy. Of course, it wasn't a kiss in the same concept as we know it today. Kiss that time resembled, rather, the sniffing, as it was the friction of the nose on the face of the partner.
1000 years later, kiss appears in the Kama Sutra, but this time he has, in fact, is erotic kissing, and the Kama Sutra mentions it over 200 times. From India to the West (particularly in Greece) will probably kiss brought Alexander the great, and among the Greeks this method instantly space downloads. Since then it has spread to other countries.
But there is also a theory that kissing originated from the ancient Romans, who noticed that the ants were affected jaws, as, "nice talking". Thus, they decided to try it. Another theory is that kissing evolved from the practice when mothers chewed food for their children, and then placed it in the mouths of kids.
However, for example, the ancient Finns believed a kiss to the top of the profanity and rudeness, despite his habit to bathe together naked. For the Romans, the kiss was a tribute to the status of a person, even a differentiated part of the body to which he belonged. Kiss to America came with Columbus and probably it was the only thing he brought with him, and that indigenous people were grateful. In the 16th century in Naples a kiss was considered an offense for which the death penalty threatened.