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Sphincter

Sphincter: A ring of muscle that works as a valve. The best-known sphincter is the anus. Most people don’t realize there are two urinary sphincters, a short distance apart. One is mostly involuntarily controlled, and the other is voluntarily controlled. This is why sometimes when you want to pee, it takes a moment to get started.

People who practice catheter play or deep sounding can feel the urinary sphincters when they are penetrated. You’ll feel a sudden but sort of sweet ‘gotta pee’ feeling as the object passes through each sphincter.

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