
Maithuna or Mithuna 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 ...
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http://en.wikipedia.org/wiki/Maithuna

(from the article `Buddhism`) ...The last stage is divided into two phases. In the first the initiate uses controlled imagination to experience the union on an ideational level. ...
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http://www.britannica.com/eb/a-z/m/16
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