Sex magic directs the energies raised during sensual arousal to achieve a desired goal. Western sex magic often uses alchemical terminology, although its sources go back to ancient shamanism, pre-Christian Pagan practices, and some sects of Gnosticism. Basic concepts include the extension of sensual activity to build up the energy and that the thought held at orgasm comes to pass. Prominent proponents include the O.T.O., Louis T. Culling, and Aleister Crowley. In recent decades, these Western practices have been influenced by Indian and Tibetan Tantra as well as Chinese Taoist alchemy.