The Guhyasamāja is a Mahayoga class of Tantra, which features forms of ritual practice considered "left-hand" ("vamachara") such as the use of taboo substances like alcohol, consort practices, and charnel ground practices which evoke wrathful deities. Ryujun Tajima divides the tantras into those which were "a development of Mahāyānist thought" and those "formed in a rather popular mould toward the end of the eighth century and declining into the esoterism of the left", this "left esoterism" mainly refers to the Yogini tantras and later works associated with wandering yogis. This practice survives in Tibetan Buddhism, but it is rare for this to be done with an actual person. It is more common for a yogi or yogini to use an imagined consort (a buddhist tantric deity, i.e. a yidam).