We close our eyes while kissing because the brain is unable to cope with the combination of the visual data and the tactile sensation of kissing.

The study, which did not involve people kissing, suggests that, to focus on a tactile sensation, people might instinctively close their eyes.
Cognitive psychologists Polly Dalton and Sandra Murphy found “tactile [sense of touch] awareness depends on the level of perceptual load in a concurrent visual task".
However, these conclusions, published in the Journal of Experimental Psychology: Human Perception and Performance, were reached without studying couples kissing.
Study participants were instead assigned visual tasks to complete while their tactile sense was measured. To measure visual sense, participants completed letter-searching tasks of varying difficulty. The tactile response was measured by responding to a small vibration applied to one of their hands.
It is important for designers to be aware of these effects, because auditory and tactile alerts are often used in situations of high visual demand, such as driving a car or flying an aircraft.
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