Here is a response I posted to a similar question at http://www.ashastd.org/phpbb/viewtopic.php?t=196
Much of the literature says while the average Ã¢â‚¬Å“latencyÃ¢â‚¬Â period of the virus is often thought to be anywhere from one to eight months, it can actually vary widely.
Exactly Ã¢â‚¬Å“howÃ¢â‚¬Â widely? ItÃ¢â‚¬â„¢s difficult to say with certainty, but experts typically agree it may take years after exposure before lesions associated with HPV (that is, warts or cell changes) are detected clinically.
This is because HPV can actually exist in deeper skin cells in very small numbers without causing disease, such as warts, that is easily detected clinically. This may go on for an indefinite number of years. ItÃ¢â‚¬â„¢s difficult for researchers to pin down exactly why some will experience lesions that are diagnosed while others do not, but co-factors could involve smoking, pregnancy, stress, diet, or a host of other things that can affect the immune system.
We understand itÃ¢â‚¬â„¢s frustrating that no one can offer a definitive response to your individual circumstances. If there was no reason to suspect infidelity prior to the HPV diagnosis, itÃ¢â‚¬â„¢s difficult to look at this diagnosis, taken by itself, as an indication that anyone has been unfaithful. The Ã¢â‚¬Å“whoÃ¢â‚¬Â and Ã¢â‚¬Å“whenÃ¢â‚¬Â questions, however, may never truly be answered.
Hope this helps,