Why do girls like to kiss their girlfriends?

There are several situations in which girlfriends kiss. First, gay or bisexual. The second is curiosity, so we play together. Third, good feelings, kissing is a way to express love, feelings can not stop, friendship. Fourth, without a boyfriend, practicing together is purely a lip friend, which is very popular in Japan. I also kiss my best friend, and I enjoy it. Girls have soft lips and feel different from men. Depends on what you think. Some people like to regard other people's practices as disgusting, abnormal or evil. In fact, the real evil pervert is himself. It is okay to look at everything with a normal heart. I don't understand because I have little knowledge.