, 19th century.]]A kiss is a touching with the lip, which is used as an expression of affection, or as a greeting or a farewell; more intense kissing is used to express romantic affection or sexual desire. The word comes from Old English cyssan "to kiss," in turn from coss "a kiss." Kisses take on a number of figurative meanings in folklore, literature, and art, ranging from the betrayal (with Judas' kiss) to the life-giving symbolism of films such as The Little Mermaid. Biology and Evolution ]]Anthropologists have not reached a consensus as to whether kissing is a learned or an instinctive behavior. It may be related to grooming behavior also seen between other animals, or arising as a result of mothers premasticating food for their children.http://www.langmaker.com/db/Premastication Kissing allows prospective mates to smell and taste each other's pheromones for biological compatibility. Women are subcons