If only we knew more about the HPV/oral cancer mechanism, these decisions would be easier. Since it's currently impossible to determine exact exposure source, I agree with the advice that informing former partners is not the answer.

The problem is not who gave it to whom, but why some individuals do not clear it.

Do we even know how long until HPV can present as cancer? Rich's post indicates that his MO believes it could be 20 years. I also have read that lengthy "incubation periods" are a possibility.