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The penis can be 'cracked' in a manner analogous to the cracking of one's knuckles. This can occur accidentally, or as a result of a practice known from Iran.
NOTE: NSFW: Explicit photo on the Wikipedia page.
https://en.wikipedia.org/wiki/Penile_fracturePenile fracture is rupture of one or both of the tunica albuginea, the fibrous coverings that envelop the penis's corpora cavernosa. It is caused by rapid blunt force to an erect penis, usually during vaginal intercourse, or aggressive masturbation. It sometimes also involves partial or complete rupture of the urethra or injury to the dorsal nerves, veins and arteries. ...
A popping or cracking sound, significant pain, swelling, immediate loss of erection leading to flaccidity, and skin hematoma of various sizes are commonly associated with the sexual event ...
Penile fracture is a relatively uncommon clinical condition. Vaginal intercourse and aggressive masturbation are the most common causes. ...
NOTE: NSFW: Explicit photo on the Wikipedia page.
https://www.urologyhealth.org/urology-a-z/p/penile-trauma... Injury to the penis is rare when it isn't erect because it is flexible. During an erection, blood flow in the arteries makes the penis firm. ... The penis may then bend sharply despite the erection. You may feel a sharp pain in the penis and maybe hear a "popping" sound. This is often followed by a rapid loss of the erection. The pain and sound are made by a tear in the tunica albuginea, which is stretched tightly during an erection. Urologists often call this injury a penile "fracture," even though there is no bone in the penis. The pain may last for a short time or it may continue. Blood can build up under the skin of the penis (hematoma), and may become swollen and badly bruised. Blood at the tip of the penis or in the urine is a sign of a serious injury to the urethra.