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Kim Seong-do is the most important of the Korean forerunners of the Unification movement, yet we hear very little about her. Most, if not all, of the key teachings of the Divine Principle originated with her, as I will show. She came up with these teachings in 1923, when Sun Myung Moon was only three years old. Her theology was later taken up by other sects in Korea
https://tragedyofthesixmarys.com/kim-seong-do-and-roots-of-divine-principle/
P'ikareum (Korean: 피가름 or 피갈음: "blood purification" or "blood exchange") is a controversial religious practice in some new religious movements of Korea...
the practice consists "of a female neophyte engaging in ritual sexual intercourse with the messianic leader [of the movement], in order to restore – either literally or symbolically – the sexual purity of the woman"...
there were cases where the messianic leader was female and the neophyte male
https://en.wikipedia.org/wiki/P%27ikareum