The earliest reference to kissing-like behavior comes from the Vedas, Sanskrit scriptures that informed Hinduism,[3] Buddhism and the Jain religion, around 3,500 years ago, according to Vaughn Bryant, an anthropologist at Texas A&M University who specializes in the history of the kiss.
Both lip and tongue kissing are mentioned in Sumerian poetry:
My lips are too small, they know not to kiss.
My precious sweet, lying by my heart,
one by one "tonguemaking," one by one.
When my sweet precious, my heart, had lain down too,
each of them in turn kissing with the tongue, each in turn.