Historian John M. Riddle has controversially argued that this practice was much more prevalent in the Middle Ages than often thought. In the absence of more standard ways of doing this practice, writers like al-Rāzī and Soranus of Ephesus advised jumping backwards seven times and sneezing repeatedly. (15[1])The exploitation of barbasqueros in the mid-20th century followed Russell Marker’s creation of a new method for this practice using Mexican yams. (15[2])The Kahun Papyrus recommends (*) crocodile dung for this practice. (10[2])This practice allegedly drove the silphium (10[1])plant (10[1])to extinction. (10[2])Writers like Hippocrates described methods for this practice such as primitive forms of the pessary. For 10 points, for much of human history, the most effective form of what practice was coitus interruptus? ■END■