Can I get an STI from oral sex?

By  Play It Safe     |    Updated: 19th January, 2022    |    6 min read

While you can’t get pregnant from oral sex, it doesn’t mean that oral sex is a no-risk situation. Oral sex (using your mouth to pleasure someone’s penisvagina, or anus) is still sex, and still involves sexual contact that could increase your risk of spreading or getting an STI.

Yep! You heard that right. While you might think you’re playing it safe by using condoms every time you have sexual intercourse, you’re still at risk if you’re not paying the same attention to staying safe during oral sex.

“The risk of getting STIs via oral sex versus vaginal or anal sex is definitely lower, but it’s still there,” said Nurse Nettie, NSW Health’s sexual health nurse. “Like with all things safe sex, the best way to protect yourself is to use condoms if you’re giving oral sex to someone with a penis, or a dental dam if you’re giving oral sex to someone with a vagina. And of course, always get an STI test if you’ve had any type of unprotected sex.”

Here’s why and how you should protect yourself and your sexual partner during oral sex.

What STIs can be passed on from oral sex?

There are a few different infections that can be passed on via oral sex and your doctor can let you know if you need to get tested for them.

Genital herpes/oral herpes

This is the most common STI passed on via oral sex in Australia. You may not realise it, but those cold sores you get on your mouth every once in a while are actually caused by Herpes Simplex Virus type 1 (HSV 1). Almost half of the genital herpes is caused by HSV 1, passed from the mouth to the genitals during oral sex.

Herpes (officially known as HSV1 or HSV2) is one of the most common STIs in Australia. However, most people never know they have it because they don’t get symptoms.

If you do have symptoms, it might include pain or tingling around the lips, genitals or bum, followed by blisters that heal on their own. Make sure you avoid all sex if you have a flare-up – that’s the best way to stay safe.


Chlamydia is a curable bacterial infection that if left untreated can cause serious complications including infertility, pelvic inflammatory disease (PID) and painful swelling of the testicles. The great news is that chlamydia is easy to treat with a course of antibiotics. Chlamydia often has no symptoms, which is why getting tested is so important.


Sometimes referred to as ‘Gono’, gonorrhea is another bacterial infection that can be passed on via oral sex as well as intercourse. Like chlamydia, it’s curable if diagnosed. If left untreated it can cause infertility, pain and swelling of the testicles and Pelvic inflammatory disease (PID).


Although not as common, syphilis can also be passed on via oral sex. It’s another bacterial infection which if left untreated can cause serious implications. Symptoms include ulcers in the mouth, penis, vagina or anus, and a red rash on the body.

Hepatitis A

Hepatitis A is only passed through oral sex to the bum or rimming. When someone gets Hep A they’ll feel super crook for a few weeks, then they usually get better. There’s also a vaccine.

When should you get an oral STI test?

Not everyone will need a test for all STIs, but if you’ve given or received unprotected oral sex, it’s a good idea to see your GP or visit a sexual health clinic for advice about testing. Getting tested is usually free and often as simple as peeing in a cup.

Remember, we usually can’t tell when someone has an STI, as symptoms aren’t often visible, so barrier protection (condoms and dams) is the best way to avoid STIs during oral sex. Our motto is condoms/dams + regular STI testing = all the fun and none of the worry.

How is STI testing done in the mouth?

You can get STI testing at your regular doctor (GP) or at a sexual health clinic. Depending on the type of sex that you’ve been having – and with who – your doctor may suggest different types of tests. Below are some of the most common tests for oral sex and other types of sex too. After all – if you’re concerned about STIs in the mouth you might as well get your other tests while you’re there too, right?

  • Chlamydia and gonorrhea: a quick pee in a cup or a genital swab. If your doctor is concerned about oral then it will be a quick swab of the throat
  • HIV: this is a quick and easy blood test
  • Herpes: herpes is only tested when you have symptoms. If you have noticed blisters or an unexplained cut around your genitals, your doctor might offer you a swab test to see if it’s herpes
  • Syphilis: This will include a blood test or a swab if you have a chance (the medical name for a syphilis ulcer) or unexplained sore

Protecting yourself from STIs during oral sex

Thankfully, it’s easy to protect yourself and your partner during oral sex – just use barrier protection Like condoms or dental dams.


These are the best protection if you’re giving/receiving oral sex involving a penis. They can be purchased easily and are available in a wide variety of brands and sizes. If the taste of latex isn’t for you (and let’s face it, latex condoms aren’t exactly delicious), look for flavoured condoms and lubricants. Find out where you can buy condoms.

Dental dams

Dental dams are not as common as condoms but are an excellent way to protect against STIs during oral sex around the vagina or bum. A dental dam is a thin, flexible piece of latex that protects against mouth to vagina or mouth to anus contact. They can be tricky to get hold of but you can always make your own out of a condom dental dam.

Do I have an STI?

If you’re asking yourself “do I have an STI?” then the best thing to do is to simply go and get tested. It’s easy, quick, usually painless and can be completely free if you use your Medicare card at a ‘bulk billing’ doctor.

If you don’t have Medicare, you may still be able to get a free STI test at a Sexual Health Clinic in NSW. And, don’t worry – if you’re concerned about anonymity – your results will always be kept confidential and if you’re diagnosed with an STI, many are easy to treat with a simple course of antibiotics.

If you have questions contact the NSW Sexual Health Infolink on 1800 451 624 between 9:00am and 5:30pm Monday to Friday to talk with a sexual health nurse. It’s confidential and free if you call from a landline.

If you’d like more advice or guidance on how to have safe sex, why not ask a question on the Play Safe forum? Our Mod Squad is always ready to help.

Also check the related topics:  

Types of STI’s

Factsheet provided by Play It Safe


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