Over the past two decades, there has been a rapid increase in throat cancer in the west, to the extent that some have called it an epidemic. This has been due to a large rise in a specific type of throat cancer called oropharyngeal cancer (the area of the tonsils and back of the throat). The main cause of this cancer is the human papillomavirus (HPV), which are also the main cause of cancer of the cervix. Oropharyngeal cancer has now become more common than cervical cancer in the US and the UK.

HPV is sexually transmitted. For oropharyngeal cancer, the main risk factor is the number of lifetime sexual partners, especially oral sex. Those with six or more lifetime oral-sex partners are 8.5 times more likely to develop

oropharyngeal cancer than those who do not practise oral sex.

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Behavioural trends studies show that oral sex is very prevalent in some countries. In a study that my colleagues and I conducted in almost 1,000 people having tonsillectomy for non-cancer reasons in the UK, 80% of adults reported practising oral sex at some point in their lives. Yet, mercifully, only a small number of those people develop oropharyngeal cancer. Why that is, is not clear.

Read more: The Conversation