What best describes the development of deep tongue kissing in humans?

The Evolutionary Analysis of Deep Mouth (French/Tongue) Kissing
Lip smacking is common in primates (monkeys, apes and humans) to signal appeasement (peace and good will) and pleasure. Chimpanzees engage in lip-lip kissing to signal greetings and to reinforce bonds between individuals. Lip-lip kissing exists in 90% of cultures and appears to be universal in humans, as seen from cross-cultural and historical evidence, as a form of greeting, reinforcing social bonds between individuals, and increasing sexual desire in mating couples. Some evolutionary psychologists believe that important information in the form of chemical reactions due to the tastes, odors, and feelings of lip-lip kissing are exchanged between a mating couple and this contributes to their mating behavior. This is reflected in King Solomon’s Song of Songs which says, “Thy lips drip as the honeycomb, my spouse: Honey and milk are under thy tongue” and describes “kisses as sweet as wine”. All of this suggests that humans interpret kisses as sweet, desirable, and intoxicating, that is, something which disinhibits us and makes us lose control.
Desmond Morris believes that lip-lip kissing in adults may have evolved from a feeding behavior exhibited by many primate females with their young. Among non-human primates, the mothers chew food, press their lips to their children’s mouths and spit the food into the mouths of the children. It is speculated that in times of food scarcity primate mothers may have begun to press their lips to their children’s lips, as when feeding, to comfort them. Human mothers in hunting and gathering societies, and presumably early human mothers, do the same thing and sometimes use their tongues to push the food deeper into the child’s mouth. The comforting, bonding qualities of lip-lip kissing between mother-child may have developed between adults as a reliable part of mating behavior. In summary, it does appear that lip-lip kissing between human mating partners evolved from mother-child feeding behavior and served to increase the bonding and sexual desire in a mating couple.
The question that remains is as follows: What best describes the development of deep tongue kissing in humans? Is it best described as an adaptation, a by-product, or noise? We do not know too much about it. It appears to exist primarily in humans and not in other primates. However, it has been reported that bonobos, a form of chimpanzee whose behavior, especially their sexual behavior, is more similar to humans than the common chimpanzee, do engage in deep mouth kissing while common chimpanzees do not. As stated above, human mothers use their tongues to push chewed food deeper in their children’s mouths. Although deep mouth kissing does exist cross-culturally and cross-historically, it occurs less reliably across cultures and historical periods than does lip-lip kissing. It does not occur in some cultures because people find it disgusting. In fact, most humans avoid human secretions (e.g., saliva, mucous, blood) in general and find them disgusting. This experience of disgust and thus avoidance is seen as an adaptive response because secretions frequently contain bacteria that could be harmful. Current studies show that deep mouth kissing in teenagers quadruples their chances of getting meningitis so it can be maladaptive in some cases.
Deep mouth kissing appears to occur more frequently in cultures with good dental hygiene. So, for example, it is common in our culture but not in poorer cultures even though lip-lip kissing between couples may occur. In our own culture it is more common now than it was in the past, and this may be related to improved dental hygiene. We do not know if it existed among early humans, but we can assume they had very poor dental hygiene, due to lack of toothbrushes, tooth paste, dental floss, and dentists. Untreated dental cavities, gum disease and intestinal parasites probably created in early humans, very bad breath and poor tasting saliva.
In view of the above, and any additional information or ideas you may have, make an argument for deep mouth kissing as one of the three products of evolution: an adaptation, a by-product, or noise. Make sure that you define each of the three products, and if you argue that it is an adaptation, you must discuss how it solved an adaptive problem for early humans. Also describe the evidence for rejecting the products you rejected.
Write your essay in three paragraphs as follows:
Paragraph 1:
​The purpose of this essay is to describe the three products of the evolutionary process and to apply them to deep mouth kissing in humans. The three products are a, b, and c. A is …. etc.
Paragraph 2:
​Deep mouth kissing is best described as x for several reasons. One, … Two, .., Three…. etc.
Paragraph 3:
​Deep mouth kissing is not well-described as y because. It is not well described as z because. Etc.

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