But there's been a sharp rise in people being diagnosed with mouth cancer, something that can be linked with oral sex.
How is that possible? You're probably wondering.
It's through the spread of a virus called human papillomavirus (HPV), which is known to cause cancer.
Just like herpes and gonorrhoea (yes, you can catch that through oral sex too), the HPV virus can be passed on from genital to mouth contact.
HPV is a very common sexually transmitted disease which affects at least half of people who are sexually active – four out of five people will contract some form of the virus at least once in their life.
In most cases, the body fights off the virus and there's no need for treatment… you probably won't even have any symptoms.
The HPV infection affects the skin and mucosa – any moist membrane, such as the lining of the mouth and throat, the cervix and the anus – and it's linked to cancer.
It doesn't directly cause cancer, but it causes mutations in cells that cause the disease to develop.
HPV is linked to most cervical cancer cases, which is why the NHS has rolled out a vaccination for eligible girls, and soon boys, to protect against the infection.
The vaccine is expected to see a drop in the number of cervical cancer cases.
HPV can also infect your mouth, meaning it can cause cells in the mucous lining to change and become abnormal.
FIND OUT MORE What is mouth cancer, what are the symptoms, what causes oral and tongue cancers and what are the early signs?
Once that starts happening you can develop mouth cancer.
The numbers of people being diagnosed with mouth cancer has risen 135 per cent in the last 20 years, new figures have revealed.
More than 8,000 Brits are told they've got the disease every year – and some 50 per cent of cases are linked to smoking and oral sex.
Dr Sarah Jarvis, GP and clinical director of patient.info, told The Sun that porn might also play a role.
"It's entirely possible that porn is fuelling the rise of oral cancers," she said.
"Today compared to 20 years ago, there'd be no real difference. Today compared to 50 years ago, yes, definitely. 50 years ago, women – at least 'nice' women didn't have oral sex. Today, they do."
Mouth cancer has traditionally been something older men tend to develop, but according to a report by the Oral Health Foundation and Simplyhealth Professionals, it's now becoming more common in women and younger people.
Around one in four mouth cancers and one in three throat cancers are linked to HPV, according to the NHS.
The types of HPV found in the mouth are almost entirely sexually transmitted, so it's likely that oral sex is the primary route of getting them.
There are some 100 types of HPV, but only 15 are linked to cancer and considered "high-risk".
It's hard to say how common HPV is in the mouth, but some studies have found less that ten in 100 men and women carried potentially cancer-causing strains of the infection in their mouth.
It was more common in smokers and men who had multiple oral sex partners.
By now you're probably wondering who is most at risk.
In short, there's very little research into who is most at risk but what has been done points towards men.
HPV-related oesophageal cancer is twice as common in men than it is in women, typically affected men in their 40s and 50s.
That might be because the concentration of HPV is usually higher in a woman's vulva than it is in the skin of a man's penis.
But, as mentioned, the number of cases directly linked to HPV are still pretty low, so you don't need to start panicking about your sex life just yet.
If you're worried about mouth cancer though, especially if you are showing signs, you should speak to a GP.
The warning signs to look out for include red or white patches on your tongue; ulcers than don't heal in three weeks; swelling in your mouth that lasts more than three weeks; pain when swallowing; and feeling like something is stuck in your throat.
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