A practice done by several messianic Christian groups in Korea in the 40s-60s. Rumor has it that Reverend Sun Myung Moon of the Unification Church continued this practice (and out of it fathered several children, two being Sammy Pak ((adopted son of Bo Hi Pak)) and Hee Jin nim).
The practice was for the Messiah to have sex with women in order to restore them and "purify their wombs".
I heard Rev. Moon is all about pikareun, despite it being so controversial.