How to solve the dry word in the eight characters?

Judging from the existing classics, the word "gan" was first used in the Book of Changes, and the original meaning of "gan" is in the name of hexagrams, which means "Jian Jin". "Fuck" itself is one of the gossip, representing heaven. In the past, it also referred to men. It is often combined with the word "Kun" to form "Gankun", which symbolizes heaven and earth, yin and yang, etc.