Oral sex causes mouth cancer?

Mouth cancer is quite a rare disease; mostly heavy smoking and drinking can cause this type of tumor. Now researchers found that in a small number of people with oral cancer the HPV virus was present; its presence was more common amongst people who practiced oral sex, than in smoker cancer patients. The good news is that oral cancer is still very infrequent; tobacco and alcohol are by far the biggest causes, so you don't have to say no to oral sex.