It's no ones fault he has cancer. Don't do that to yourself. My dad chewed snuff since he was 11 until he was 64. We used to argue all the time about quitting tobacco. My mom had a heart attack and triple bypass in 2009, and I was really adamant that he should quit. When he was diagnosed, I was so sad. Then, I got mad at him. Of course, I KNOW he didn't cause this. Some people smoke and drink their whole life and don't get cancer. Some people never smoke or drink and get cancer. Sometimes, when you're grieving you try to blame someone or something and it really does no good. Your energy is better spent moving forward. Just as an fyi, I believe there may be non-sexual ways of contracting HPV. A quick search of scholarly articles provides this: https://obgyn.onlinelibrary.wiley.com/doi/full/10.1111/jog.13248