Apparently, yoga originates from Tantric sex cults. So says the senior science writer at the NY Times in a sequel to his debut about how yoga kills. Scholars have long debated the origins of yoga, which existed as a purely oral tradition for thousands of years. I may not have any academic bona fides but I think it's safe to say that just because there is a document, dating back to medieval India, stating that cobra pose has the specific purpose of sexual arousal doesn't necessarily mean that yoga originated from Tantric sex cults.