First, they are used to.
People in the whole world, when they are in a romantic situation, feel an unconscious necessity to kiss. It’s one of the most useful discoveries I ever made. The opposite sex seems to be programed to kiss. If you realize it, you’ll be get more satisfaction from the kisses. This program functions from day to day. People watch actors and actresses kissing on the screen, in a cinema or advertisement. They see people kissing on the street. As a result, a kiss is considered a an obligatory thing in the situations described above. In such situations it’s an unconscious stereotype that makes people want to kiss in spite of everything.