What is the success ratio for learning the method? What was the most common problem for those who failed?
Two groups of men were studied in succession. The first group achieved a 70% success ratio. Then the instruction was fine-tuned to include their feedback. Using these improvements, the second group achieved a 90% success ratio. Both groups encompassed men from 20 to their mid 50s. Click on Interviews with Men Who Multiple in this website to meet some of these men and their girlfriends. The only men who failed to multiple in the study were those who described themselves as hard-to-come types. Not all these men failed to multiple, but all of those who did fail in the study were hard-to-come types. On the other hand, men who tended toward premature ejaculation had the easiest time learning it.
