Up until now, most people have accepted kissing with their eyes closed as "just one of those things that happen".
Well, psychologists have now revealed the real reason why we close our eyes when locking lips.
Turns out, the brain can't deal with more than two things at once - and needs to focus on the task at hand. To adapt, we simply close our eyes when we kiss.
The study on vision and tactile sensory experience was carried out by Royal Holloway University of London, and concluded that our brain struggles to process another sense while also concentrating on the visual stimuli.
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".