http://www.octanecreative.com/ducttape/hmo/index.html

Among other uses here is one that stands out:

"Preparation DT Sometimes hemorrhoids must be removed surgically. A hemorrhoid is cause by a blood clot in tiny blood vessels around the anus. So, how does a doctor cut the clot out if he/she is alone with the patient in his office. How does he/she keep the butt cheeks apart in order to get at the anus for the inpatient operation. It is easy with duct tape. The patient lies belly down on the examination table, butt naked. The doctor then gets two strips of duct tape. He applies an end of each strip to each of the butt cheeks. Then he pulls each cheek away from the anus and applies the other end of each strip to the table. Thus, the butt cheeks are spread apart leaving the anus fully exposed and the patient incapacitated from being able to "pucker" when antiseptic, injections, and the scalpel are applied. When the procedure is completed, the tape is removed with quick vigorous pulls. And how do I know? Experience. --- Stephen M. R."