"men and women who reported having six or more oral-sex partners during their lifetime had a nearly ninefold increased risk of developing cancer of the tonsils or at the base of the tongue. Of the 300 study participants, those infected with HPV were also 32 times more likely to develop this type of oral cancer than those who did not have the virus."
http://www.time.com/time/health/article/0,8599,1619814,00.html
http://www.time.com/time/health/article/0,8599,1619814,00.html