This is called a "penile fracture," and it most commonly occurs during sexual activity.

It is possible for the vein to rupture, which presents in a manner similar to penile fracture.

Penile fracture is a medical emergency, and emergency surgical repair is the usual treatment.

Fortunately, penile fractures are rare.

Taqaandan is said to be painless and has been compared to cracking one's knuckles, but the practice of taqaandan has led to an increase in the prevalence of penile fractures in western Iran.