The second ring – what is it in our anatomy?
The technical term for the second ring is “sphincter ani internus“, which literally means “internal sphincter“. It’s a different muscle type from the outer sphincter (or butthole). It’s comprised of something called “smooth muscle” much like the muscles of our circulatory system. This internal sphincter is an involuntary muscle approximately 5-6 inches inside the anus that responds to moods and things like anxiety or excitement. As you might imagine, then, that puncturing the second ring in a certain way triggers the wave of euphoria, involuntary shaking, and sudden emotional outbursts seen during cunting.
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