This is really important info, although a bit scary to read. Many men are exposed to the HPV virus through oral sex (mostly with women, as they carry more of the virus), and the virus might have no symptoms until they show up years later in the form of oral cancer. A Silent Epidemic Of Cancer Is Rising Among Men
My Dad just had this cancer and had to go through treatment at age 84 - 85 which almost killed him. His doctors said he basically contracted the HPV virus through promiscuous sexual activity when he was younger (he was very promiscuous). They said that not all HPV viruses lead to the cancer, just a few strains.
Something to be aware of, and maybe ask your doctor about if you suspect you might be at risk.