a burning sensation
One day, a man went to the doctor because he was getting a burning sensation every time that he pooped. The doctor told him that in order to get rid of it, he would need to clean out his colon once a week for the next month. He gave the man a cleaning rod and shoved it up his butt for the first cleaning.
The man took the rod home and a week later tried to attempt the cleaning himself. However, he couldn't get it in at the right angle by himself so he called in his wife. She sympathetically shoved it up and cleaned his colon for him when he let out a gasp. "What is it Sweetheart?" asked his wife.
"I just realized," answered the man "that when the doctor did it, he had both hands on my shoulders!"