Reminds me of this quote:
"The prime objective of a hemorrhoidectomy is to remove the offending varicosity with as little damage as possible to the patient. Of all the structures in the area, one stands out as the king. You can damage, deform, ruin, remove, abuse, amputate, maim, or mutilate every structure in and around the anus except one. That structure is the sphincter ani. There is not a muscle or structure in the body that has a more keenly developed sense of alertness and ability to accommodate itself to varying situations. It is like the goalie in hockey...always alert."
They say man has succeeded where the animal fails because of the clever use of his hands, yet when compared to the hands, the sphincter ani (anal sphincter) is far superior. If you place into your cupped hands a mixture of fluid, solid, and gas and then through an opening at the bottom you try to let only the gas escape, you will fail. But the anal sphincter can do it. The sphincter can apparently differentiate between solid, liquid, and gas. It apparently can tell whether its owner is alone or with someone, whether standing or sitting down, whether its owner has his pants on or off. No other muscle of the body is such a protector of the dignity of man, yet so ready to come to his relief."
As quoted from Dr. Walter C. Bornemeier