Cock rings have actually been used for centuries and they're usually safe, but problems arise when the ring is too tight or it's a DIY version made from rubber bands, hair ties, string, etc.
They can cut off circulation and cause the penis to go white, numb, and cold like when you tie a string around your finger.
You should also be washing your penis after you have sex, because fluids from your partner might allow more bacteria to grow.
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But if you do tear your foreskin, you should keep the area clean and avoid sexual activity until it heals.
Description: Luckily, phimosis can be easily fixed with a procedure, says Morgentaler, so head to your doctor right away if this happens. But even if you don't fracture your penis, repeatedly bending it with too much force can also cause serious problems.