I have never had a rigid sigmoidoscopy, but back in 1973 I had a friend who was extremely anal retentive. When his doctor advised him that he needed to see a proctologist for bowel problems my friend was experiencing, my friend told me he was going to cancel the appointment his doctor had made. I advised him that that seemed like a bad idea, since something major might be wrong with him.
Being the voyeur that I am, I offered to go with him for the exam. I was sure the proctologist was not going to let me go into the procedure room with my friend, but when my friend insisted I go in there with him, the doctor said it would not be a problem.
I was a little nervous because I didn't know exactly how my friend would react to the procedure, since he was extremely sensitive to anyone touching him "down there".
Actually, he endured the procedure much better than I had anticipated.
As soon as the nurse escorted us to the procedure room, she told my friend to undress from the waist down, and take a seat on one of the chairs, covering himself with a sheet she had provided him.
Within a matter of minutes the doctor came in, asked my friend to come to the foot of this special tilting table, and to kneel on the protruding shelf. My friend knelt on the shelf, then the doctor stepped on a pedal that made the table raise up a few feet, then started to tilt until my friends' head was almost touching the floor, and his butt and feet were in the air.
As I was sitting there I started having weird thoughts . . . like, when a person is asked to undress from the waist down, why do they usually take off their socks? Logically, leaving your socks on would keep your feet warm, and there would be absolutely no reason to take them off.
But my friend looked so pathetic, with his butt and bare feet sticking up in the air. It was also weird watching my friend struggling with the fact that he now had to either face me or the doctor standing beside him. Ultimately he chose to face me, and when the doctor started to insert the scope, my friend's face just went ashen. His mouth dropped open, and his toes curled up. All he could say was "Oh, God!" And since he had never had anything inserted into his butt, he was completely overcome by the sensations. He just kept repeating "I have to go to the john!". The doctor tried to reassure him that it was just a sensation, but everytime the scope was advanced or moved, my friend insisted again that he needed to "poop"!
When the scope was finally removed, my friend looked like he had been hit by a truck. His face was flushed, there were actually tears in his eyes, and as the doctor lowered the table, my friend was told to just lie still for a few minutes until he could gather his composure.
I know my friend was really embarrassed and ashamed that I witnessed his humiliation, but I tried to reassure him that I was sure most people would react the way he did, but he knew better. Obviously, that exam was never mentioned by us again.