A kiss (from Old English cyssan "to kiss", in turn from coss "a kiss", perhaps onomatopoeic) is the touching of the lips to some other thing, usually another person. The science of kissing is called Philematology.
Kissing is a learned behavior, related to the grooming behavior seen between other animals. Many non-human primates also exhibit kissing behavior.
Between people of close acquaintance, a kiss, often reciprocal, is offered as a greeting or a good-bye. This kind of kiss is typically made by brief contact of puckered lips to the skin of the cheek or no contact at all, and merely performed in the air near the cheek with the cheeks touching. Such kissing is a common greeting in European and Latin American countries between a man and a woman or between two women but also by two men in the middle east. Relatives may kiss children to comfort them or show affection, and vice versa.
As an expression of romantic affection or sexual desire, kissing involves two people kissing one another on the lips, usually with much more intensity, and for a considerably longer period of time. In more passionate kissing couples may open their mouths, suck on each others' lips, or move their tongues into each others' mouths (see French kissing). Sexualised kissing may also involve one person kissing another on various parts of the body.
In romantic and sexual kissing, the physical sensations are often of primary importance. One might find it stimulating if their partner moved their tongue in small circles against their own, or bite the lips gently.
Kissing may also be used to signify reverence and subordination, as in kissing the ring of a king or pope. A kiss can also be rude or done for the sake of irritating or proving one's superiority. A rude kiss or a kiss with a smack is referred to, in the United States, as a buss.
A more ominous use of the kiss is as a symbol of condemnation as may be observed when a crime lord kisses an underling, in effect imposing a death sentence upon that person, the ultimate "goodbye kiss" or the "kiss of death". Indeed, Judas is said to have betrayed Jesus with a kiss.
The term Kissing Hands is used to formally describe the appointment of the senior state figures to office by British monarchs. Though in the past, the monarch's hand was actually kissed, this is no longer so. When figures such as the British Prime Minister, cabinet members and diplomatics are formally appointed, they are said to have Kissed Hands. (Kissing the hand is still practised as a romantic flourish, especially in Latin countries.)
Samurai kiss.jpg|left|thumb|280px|Man kissing boy
Miyagawa Isshô, ca. 1750; One of ten panels on shudo themes from a shunga-style painted hand scroll. Private collection.]]
In internet and IRC chat, kiss is expressed by the characters xx or the :-* smiley.
When someone has done something magnificent for another person, that person may sometimes say, "I could just Kiss you!" because of their gratefulness, and not actually do it. This is commonly done to express complete gratefulness among friends who are either same sex or moderately close friends to one another.
The term is also used for expressions of affection that do not involve the lips. The "Eskimo kiss" is executed by the two individuals gently rubbing the tips of their noses together — in the Māori culture of New Zealand this is called a hongi. A "butterfly kiss" consists of two people putting their eyes close to each other and fluttering their eyelashes upon one another's. A caterpillar kiss consists of two people rubbing their eyebrows together. Caterpillar kisses often give way to butterfly kisses.
The kiss does not exist in all cultures, as certain societies find it repugnant.
A kiss can be "blown" using actions of the hand and the mouth. This is used to convey affection usually while parting, when the partners are physically distant but can view each other. Blown kisses are also used when a popular person wishes to convey affection to a large crowd or audience.
In order to avoid clashing noses, a couple will often turn their faces to one side or another when kissing, so that their heads are at an angle from one another. Often, to make this more comfortable, one person, sitting upright, will support another, perhaps across their lap and in their arms, thus combining hugging and kissing. The person supporting the other is most likely taking the more active role in kissing the other. Writing in Nature, psychologist Onur Güntürkün observed couples kissing in public places such as airports and parks, and showed that the direction of turning is more frequently to the right than the left by a 2:1 ratio. Güntürkün ascribed this asymmetry to a neonatal right side preference *.
Kissing is a complex behaviour that requires significant coordination. The most important muscle involved is the orbicularis oris muscle; it is used to pucker the lips and informally known as the kissing muscle. The tongue can also be an important part of the kiss.
Emotion | Interpersonal relationships | Intimate relationships | Kissing games | Personal life
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