Cock ring

A constriction ring worn around the penis, sometimes around the penis and testicles, to slow blood leaving erectile tissue and help maintain an erection.

Penile erection: Penile erection is enlargement and stiffening of the penis as blood fills erectile tissue. A cock ring can help sustain an erection by slowing venous blood flow.
Erectile dysfunction treatment: Erectile dysfunction treatment includes behavioral, medical, and device-based approaches to improve erections. A constriction ring can be part of a device-based approach.
Corpus cavernosum: A corpus cavernosum is one of two erectile bodies that fill with blood during penile erection. These paired structures are the main erectile tissue whose blood retention supports rigidity.
Penile prosthesis: A penile prosthesis is an implanted device that enables an erection, usually through inflatable or bendable components. It is a surgical alternative for erectile dysfunction, rather than an external constriction device.
Penile ischemia: Penile ischemia is inadequate blood supply to penile tissue. Excessive constriction can compromise circulation and cause tissue injury.
Venous occlusion: Venous occlusion is the restriction or blockage of blood flow through veins. Constriction around the penis is intended to slow blood leaving erectile tissue.
Vacuum erection therapy: Vacuum erection therapy uses a cylinder and pump to draw blood into the penis, often followed by a constriction ring. The ring commonly retains the erection created by the vacuum device.
Corpus spongiosum: The corpus spongiosum is erectile tissue surrounding the urethra and forming the glans of the penis. It is another erectile structure affected by constriction around the penis.
Penile tourniquet: A penile tourniquet is a constricting device used to restrict penile blood flow, typically in medical procedures or emergencies. It shares constriction with a cock ring but has different uses and risks.
Penile edema: Penile edema is swelling caused by fluid accumulating in penile tissue. Swelling can develop when a constricting ring obstructs blood or lymphatic drainage.

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Sex toyBroader topic: Some cock rings are sold as sexual accessories that can prolong erection or alter sensation.