I think when the CDC claims that a large proportion of the sexually active population has been exposed to HPV, they are talking about the full range of HPV. It would be interesting to see the stats on just the high risk types. I bet the numbers are much lower. Probably in the 20% range. I believe the #'s for high risk HPV strains that integrate are lower still. Probably only 1-2% of the population.

There are some interesting questions regarding transmission and expression of HPV that I have, e.g. why the lack of mutual oral HPV related cancers in spouses or partners? I've read one case study where that happened, but based on these forums, it seems highly unlikely. If transmission is easily carried via fluids, i'd suspect to see much higher #'s. I think a similiar model to this may be chronic hepatitis b carriers.