As long as I can remember, comics have made fun of prostrate and colon/rectal exams. I envision the countless comedy skits involving a smiling doctor carefully putting on a "rubber" glove while saying, "bend over" or "cough loudly." To add to the comedic moment, the male patient has a horrified look on his face as he stands there whimpering and helpless.
Why would these life saving screenings be made into a laughing matter? Maybe it's because men feel that some parts of the body should remain off