The great rite is associated with the sacred marriage. Neo-Pagan witchcraft is a fertility religeon which includes intercourse.
The Rite releases enormous power which may be directed for magical purposes. It is one of the eightfold paths.
The great rite is usually performed within the magical circle. The great rite is usually carried out in a symbolic manner rather then in actuality.
The high priest plunges a ritual knife into a chalice filled with wine which is held by the high priestess.
In some covens the union is done in actuality.
A Witches' Bible: The Complete Witches Handbook
WITCHCRAFT
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