Hatha yoga — the parent of the styles now practiced around the globe — began as a branch of Tantra. In medieval India, Tantra devotees sought to fuse the male and female aspects of the cosmos into a blissful state of consciousness.

The rites of Tantric cults, while often steeped in symbolism, could also include group and individual sex. One text advised devotees to revere the female sex organ and enjoy vigorous intercourse. Candidates for worship included actresses and prostitutes, as well as the sisters of practitioners.

Hatha originated as a way to speed the Tantric agenda. It used poses, deep breathing and stimulating acts — including intercourse — to hasten rapturous bliss.