According to the article,
The earliest written record of humans’ kissing appears in Vedic Sanskrit texts — in India — from around 1500 B.C., where certain passages refer to lovers “setting mouth to mouth”
And it describes the Romans' classification of different kisses:
the “basium,” for the standard romantic kiss; the “osculum,” for the friendship kiss; and the “savium,” the most passionate kind, sometimes referred to as a French kiss.
What would we do without such grave issues to ponder?