World Kissing Day is celebrated all over the world today, a holiday born in Great Britain in 1990, but soon spread all over the world, to honor one of the simplest and at the same time precious forms that exist to show affection. On the occasion of this day, we discover that kissing, according to science, offers many benefits: 34 facial muscles set in motion and 112 postural muscles; not to mention that it strengthens the immune system and reduces stress, and for psychologists and psychiatrists, kissing helps to live better. But what are the positive effects of this gesture? First, it increases people’s affection for loved ones and at the same time causes a strong hormonal discharge in the couple. But to make people forget the beneficial value of the kiss, sometimes excessive work and a fixation for social networks get in the way. In reality there are several days dedicated to kissing. On April 13, called International Kissing Day, it was set up to commemorate the longest kiss in history, the one between a Thai couple who kissed for 46 hours 24 minutes and 9 seconds during a competition. A record topped by the same couple with another kiss that lasted 58 hours, 35 minutes and 58 seconds.In 1990 the UK instead declared July 6 as International Kissing Day, a date that is also remembered as the Day of the Stolen Kiss in some countries of the world.In the United States, the same day is celebrated on June 22 every year, while in India it is celebrated on February 13, the day before Valentine’s Day.