Preventing penile fractures and Peyronie's disease - Los Angeles Times
In some Middle East regions, men engage in a practice known as taqaandan ("to click" in Kurdish), explains Dr. Javaad Zargooshi, urology professor at Kermanshah University of Medical Sciences in Iran. It's a painless process, similar to knuckle-cracking, in which the top half of an erect penis is bent forcefully while the rest of the shaft is held stationary.
Usually this produces only a loss of erection and a satisfying popping noise, says Zargooshi, who published a report on the phenomenon in December in the Journal of Sexual Medicine. Other times, it will fracture the penis. Taqaandan is a public health concern in western Iran, where penile fractures are unusually common.
"The practice of taqaandan is increasing, and we don't know why," Zargooshi says.