Science may have the answer as to why we close our eyes when we kiss. While studying how visual stimuli can interfere with the senses, researchers at the University of London deduced that the study’s findings could also explain why people like to close their eyes while kissing.
For the study, volunteers were asked to simultaneously perform a visual search task of varying difficulty levels, while also reacting to the presence or absence of a vibration to their hand. Researchers found that participants’ sensitivity to the vibration was reduced among those who had the more challenging visual search.
Study author, Polly Dalton, told Medical Daily that, “Our research found that engaging in a more demanding visual task reduced people’s sensitivity to tactile sensations. This does imply that reducing visual demands (for example, by shutting your eyes) can improve tactile awareness, and this could be one of the reasons that people shut their eyes when kissing.”
In other words, kissing with our eyes open feels strange because the brain is doing too much, which hinders pleasure. So, to not lose out on the sensations associated with kissing, certain sensory sacrifices must be made—in this case, our sight.