Unprotected oral sex 'has become the leading cause of mouth cancer

Unprotected oral sex 'has become the leading cause of mouth cancer Smoking, chewing tobacco and excessive boozing have long been blamed for causing mouth cancer - but they are set to be overtaken by ORAL SEX. The shock revelation comes due to the spread of cases caused by HPV, or the human papillomavirus . Although HPV is in itself not actually cancerous, it can affect the cells, causing abnormal tissue growth in the mouth. This can eventually lead to mouth or oral cancer, according to online health clinic Euroclinix .