"The latest data suggest that 64% of oropharynx cancers - growing in the middle part of the throat - in the United States are caused by HPV, which is more than tobacco causes, said Maura Gillison of Ohio State University. And as the number of partners on whom you have performed oral sex goes up, the risk of oropharnyx cancer goes up."
source:
http://pagingdrgupta.blogs.cnn.com/2011/02/20/yes-oral-sex-is-sex-and-it-can-boost-cancer-risk/?hpt=T2
Moral of the story: Suck dick less often.
Comments
What about cunnilingus?