Looking at nine ways of kissing in a behavioral psychology, what do you like best?

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July 6 is the National Kissing Day, which is not a national holiday, but it is a very popular day for the past few years.There are also many people who want to promote this festival into international kissing festivals.

Unlike Valentine's Day, you can kiss your friends, work colleagues, parents, brothers and sisters, forget the complex bedtime, return to a simple kiss, and perhaps you can also use this to create a different spark!(Recommended reading: Summon Hippie Pure!The stranger kisses the photo episode: "I want to kiss your happiness" )

Based on behavioral psychology, you can also categorize the kisses, and discuss the implications of the kissing. Let's take a look at what kind of kisses you like. Today, let's kiss.:

  1. :
  2. Kiss:
  3. Kiss:
  4. Kiss: