Sexually transmitted forms of HPV account for about 25% of cancers of the mouth and upper throat (the oropharynx).  The latter commonly present in the tonsil area, and HPV is linked to the increase in oral cancers in nonsmokers.   Engaging in anal or oral sex with an HPV-infected partner may increase the risk of developing these types of cancers.  Oral infection with several types of HPV, in particular type 16, have been found to be associated with HPV-positive oropharyngeal cancer , a form of head and neck cancer .   This association is independent of tobacco and alcohol use.  In the United States, HPV is expected to replace tobacco as the main causal agent for oral cancer, and the number of newly diagnosed, HPV-associated head and neck cancers is expected to surpass that of cervical cancer cases by 2020.