Why people close their eyes during a kiss and how it affects stress levels: 5 interesting facts about kissing
SSPDaily has prepared five facts about kissing that will surprise you. Learn about their positive impact on health and stress levels.
Positive impact on stress levels
Researchers from Lafayette College (USA) have found that kissing evokes a positive emotional response. They reduce the level of cortisol, a stress hormone, in both men and women.
Benefits of kissing dogs
Scientists from the University of Arizona conducted a unique experiment. They found that kissing dogs boosts human immunity.
Bacterial metabolism
Biologists from the Netherlands, together with researchers from the Micropia microbial zoo in Amsterdam, studied the kisses of 21 pairs of volunteers and examined the state of their oral cavity afterwards. During a ten-second kiss, partners exchange approximately 80 million bacteria. In addition, those who kiss at least nine times a day have similar microbial communities in their mouths.
Close your eyes while kissing
Scientists from King's College Holloway in London explained that closing your eyes during a kiss is related to the functionality of the brain, which cannot focus on two sensory signals at the same time. Visual stimuli reduce its ability to process tactile sensations during a kiss.
The importance of turning your head
Canadian researchers at the University of Saskatchewan have found that the direction of head movement during a kiss reveals the dynamics of a relationship. After analyzing more than 500 photos of kissing couples, the researchers found that in about 80% of cases, people turned their heads to the right during a kiss. However, when kissing friends or relatives, they turned their heads to the left.