Kisses are among the favorite moments associated with falling in love. And, apart from their health benefits, there are also some interesting facts associated with them. Let’s find out more. 1. Kissing style is determined before we are born A German researcher observed more than 100 couples while kissing and noticed that two-thirds of them tilted their heads to the right. The expert believes that this instinct originates in the mother’s womb, where the baby’s head is naturally placed in this direction. 2. Kissing requires serious muscle strength Scientists from the Rayne Institute at University College London studied kissing couples during an MRI scan of their brains. They found that kissing primarily involved the orbicularis oris, a muscle located around the mouth. The researchers explain that kissing requires the coordination of a total of 146 muscles, including 34 facial and 112 postural. NEWS_MORE_BOX 3. The longest kiss lasts more than 58 hours According to the Guinness Book of Records, the longest kiss belongs to husband and wife Ekkachai and Laksana Thiranarath from Thailand. They did not part their lips for a full 58 hours, 35 minutes and 58 seconds. 4. How much of our lives do we spend kissing? Experts estimate that the average person spends 20,160 minutes of their life kissing.