Doctors have documented numerous cases of insertion of foreign bodies into the urethra, typically as the result of auto-erotic activities. This can result in infections and serious internal bleeding.^[1][2]

A wide variety of solid objects have been reported to have been inserted into the urethra, including batteries, safety pins, straws,^[2] and telephone wires.^[3] Liquefied objects have also been inserted into the urethra, such as an injection of cocaine^[4] (which, arguably, had harmful results^{[5][clarification needed]}).

The Chuck Palahniuk story "Guts", from the novel Haunted, includes the story of a boy in his early teens inserting candle wax into his urethra.^[6]

• Rectal foreign body
• Urethral sounding
• Urethral intercourse