Sounding.
Sounding refers to the medical or recreational practice of inserting a thin, smooth instrument (called a "sound") into the urethra. It originated as a medical diagnostic and treatment tool, but is also used as a fetish or sexual practice for erotic sensation. In a recreational or fetish context, people insert specially designed metal, glass, or silicone rods into the urethra for sexual pleasure. The goal is to stimulate the urethra's highly sensitive nerve endings and create an internal sensation of pressure.
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