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Maithuna (Devanagari: मैथुन) is a Sanskrit term used in Tantra most often translated as "sexual union" in a ritual context. It is the most important of the five makara and constitutes the main part of the Grand Ritual of Tantra variously known as Panchamakara, Panchatattva, and Tattva Chakra.
Although some writers, sects and schools, e.g. Yogananda, consider this to be a purely mental and symbolic act, a look at different variations (and translations) of the word maithuna clearly shows that it refers to male-female couples and their union in the physical, sexual sense and is synonymous with kriya...