Thelema Ordo Templi Orientis http://isni.org/isni/0000000122951075 https://en.wikipedia.org/wiki/Category:Ordo_Templi_Orientis https://en.wikipedia.org/wiki/Ordo_Templi_Orientis https://viaf.org/viaf/147498483 https://www.wikidata.org/wiki/Q33237 An occult initiatory organization founded at the beginning of the 20th century. The origins of the O.T.O. can be traced back to the German-speaking occultists Carl Kellner, Heinrich Klein, Franz Hartmann and Theodor Reuss. English author and occultist Aleister Crowley is the best-known and most influential member of the order. O.T.O. Originally, the Ordo Templi Orientis was intended to be modeled after and associated with European Freemasonry, such as Masonic Templar organizations, but under the leadership of Aleister Crowley, O.T.O. was reorganized around Crowley's Thelema as its central religious principle. One of the major features and core teachings of the organization is its practice of sex magic.