Urethral sounding
Sounding or
urethral sounding is a medical activity using probes called
sounds to increase the inner diameter of the urethra and to locate obstructions in the
urethra.
Sounding in a sexual context involves inserting sounds and sometimes
catheters into the urethra (sometimes stretching or dilating the urethra), and sometimes bladder, for the purpose of
sexual pleasure, an activity generally associated with
BDSM. A urethral sound may be connected to a special electrical device for use in
erotic electrostimulation. The use of urethral sounding in this way can potentially be damaging to the urethra, although risk is most significant when an inexperienced partner is involved.
Sounds are also used for the purpose of prostate stimulation via the urethra. Some sounds known as j sounds have a curvature on the inserting end that are particularly useful for prostate stimulation.
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Go Ask Alice!: "Cock-stuffing"*
BMEzine.com article with links to images of urethral sounds