This paper aims at comprehending and discussing the male/female principle of creation myths apparent in the Manchurian, the Evenk, and the Korean. In Manchurian creation myths, the creator names Abuca, the supreme goddess, who was born out of the water. She creates a universe, mankind, and other things together with her two sisters, Banamu and Warudu. On its way, God does not appear. In Evenk creation myths, the creator is god. In the midst of the creative process appears the female who is symbolically imaged. The creation accordingly suggests the union of both sexes. In Korean creation myths, there is no goddess. In \'the song of creation,\' god opens the universe by separating the sky from the earth. But except the universe creation, god appears as a controller rather than a creator. He prays the sky, and gets five golden insects and five silver ones. He brings up ten insects, which respectively turn into men and women. It represents the superiority of the male over the female in the birth of a child. As a consequence, in Korean creation myth, the goddess absolutely kept out. The Flood makes an epoch. After the Flood, the supreme goddess names Abuca withdraws from the throne in the Manchurian creation myth. On the contrary, the male god calls Abuca-eunduri ascends the throne of gods and goddesses. This mythical evolution may anticipate the transition from the maternal society to the paternal one. The view on the creative role of goddess for the birth of a child was modified. Thus, the union of both sexes gives birth to children. In Korean myths, a man and a woman who had rescued during the Flood united and gave birth to children. Although the goddess has presided over the creation myths, she grew weaker and weaker in the myths of later periods. In myths of founding country, goddess surrenders to god. Although the goddess hands over the supreme position to the god, she has a sacred diety. To be sure, in the myth of founding Koguryo, Euwha, the mother of Jumong who had built up the Koguryo empire, was regarded as an agriculture goddess. During the period of replacing both sexes, we can easily find some struggles between two sexes. According to Korean myths, the male excels the female among these struggles. In the folktale, the female has no enough ability to change the world. To illustrate, the folktale treating siblings who become the sun and the moon clearly shows that the female has no power and wisdom to get through the crises.