What's the leading cause of oral cancer? Smoking? Heavy drinking?
Actually, it's oral sex.
Scientists say that 64 percent of cancers of the oral cavity, head, and neck in the U.S. are caused by human papillomavirus (HPV), which is commonly spread via oral sex, NPR reported. The more oral sex you have - and the more oral sex partners you have - the greater the risk of developing these potentially deadly cancers. CBS News
h/t: ∞ ≠ ø