just read this articles,
Oral sex can cause throat cancer
* 22:00 09 May 2007
* NewScientist.com news service
* Roxanne KhamsiPeople who have had more than five oral-sex partners in their lifetime are 250% more likely to have throat cancer than those who do not have oral sex, a new study suggests.
The researchers believe this is because oral sex may transmit human papillomavirus (HPV), the virus implicated in the majority of cervical cancers.
The new findings should encourage people to consistently use condoms during oral sex as this could protect against HPV, the team says. Other experts say that the results provide more reason for men to receive the new HPV vaccine.
[rest of this article]
Hmm, so please becareful for you who are frequently doing oral sexes. Please be safe so that you’ll be hidden from those diseases. 
