I'm not sure on the detective part. It's possible to play detective or at least be suspicious, based of course, on circumstances.
Scenario: 10 year monogamous relationship. female partner tests positive for low strain hpv over 3 years ago on pap. No warts. Virus clears. Fast forward to today, gets annual pap, tests positive for hpv again... with a different strain... says high risk. Isn't the likely source pointing to infidelity within that 10 year period? Otherwise, the strain should have tested positive 3 years ago as well. Correct?
You will never know. Could have been a lover from ten years ago. There is no way to play detective with this virus.