A woman goes to the doctor complaining of bad knee pains. After the diagnostic tests showed nothing, the doctor questions her, There must be something youre doing that you havent told me. Can you think of anything that might be doing this to your knees?

Well, she said a little sheepishly, my husband and I have sex doggy-style on the floor every night.

Thats got to be it, said the doctor. There are plenty of other positions and ways to have sex, you know.

Not if youre going to watch T.V. there aint, she replied.