In literature the first examples of the kiss were in literature around 1500 B.C. Statues did the same around the same time :
An Indian epic poem "Mahabharata" describes kissing on the lips as a sign of affection. It was passed down orally for several hundred years before being written down and standardized around 350 A.D.
In the 6th century "Kama Sutra" describes a variety of kisses.