Why did Nuwa create humans? It's all about perpetuating species and civilization.
Why can't mating between gods continue the species? Here are two conjectures: First, the Great God broke the barrier of the universe and came to the solar system from another space, so he must adapt to the "rules" of this world, which is the basis of this world. If he cannot abide by these rules, then he will enter not this world but another world or void. In this world, the Great God cannot carry out ethnic multiplication in the original way. Second, the reproduction of the mountain and sea realms where the Great God originally existed is not necessarily accomplished through mating, but may be accomplished through body continuation so as to cut and produce new bodies, or by cultivating body shells in nurseries and then injecting souls to form new life - personally, I prefer this continuation method of body cultivation, although separation from the body is also a way of reproduction. But after all, modern humans and almost all living things combine two chromosomes to create new bodies through mating, which also proves that our most primitive life reproduction method is basically the same as our ancestors, and our ancestors are the great gods who created us, and the great gods can only use their existing and known models to create life. That is, with the help of science and technology, the body is cultivated through the incubator, and then new souls are injected in some way to achieve the creation and reproduction of new life of the ethnic group; Yes, souls can be created, or copied and separated from the original place to form new intelligent life.
But apparently, the Great God is no longer able to reproduce new species. This would mean that the one civilization that entered the solar system would die out, because they would lose the function of perpetuating civilization. The reason for the loss of reproduction is that when crossing the cosmic barrier, the breeding room was damaged, and it can no longer cultivate new species - because of this reason, it is derived from the human creation plan, the full name of this plan should be called "species civilization reproduction continuation Integration experiment", and the civilization of the Great God must have a new way of reproduction. And this way of reproduction should be suitable for the rules of the solar system, so that the great God's ethnic group, genes and civilization can continue, and after the development of this civilization through billions of years, it can break the barrier of the solar system and return to the original civilization system. Therefore, to create an intelligent life and name it human, one is for the continuation of civilization, and the other is to hope that one day with the continuous improvement and development of genes, it can return to the ancient civilization outside the solar system. This form of human existence is but an inevitable product of the emergence of hundreds of millions of genetic species, and it is good luck to become the solar system successor of this civilization.