Sexual health and STIs

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The best way to protect yourself from STIs and HIV is to have safe sex

Safe sex means taking steps to protect yourself and your sexual partners from sexually transmitted infections (STIs) and unintended pregnancy. It also means having a healthy and respectful approach to intimacy. It’s not just about whether you’re being safe, it’s about whether you feel safe too.

Protect yourself from STIs

Any type of sexual activity, including vaginal, anal and oral sex, carries a risk of STIs that can affect your health. Many STIs have no symptoms, and people often don't realise they have a sexual infection.

STIs are spread through infected:

  • semen and urethral fluid
  • vaginal fluids
  • anal fluids
  • blood
  • skin-to-skin contact

The Sexually Transmissible Infection (STI) fact sheets have more detail about different STIs, including how they are transmitted, symptoms, prevention methods, when to get tested, and how to get treated.

Practicing safe sex

Consent

Without consent, sex shouldn't happen. Sounds simple? That's because it is. Here are a few other things to remember when it comes to consent:

  • Consent is a rolling concept. You, or your partner, can change their mind at any time
  • Consent is more than just words; it's non-verbal communication too.
  • Remember, coercing someone into having sex isn't consent – it's pressure and it's not acceptable under any circumstances

Condoms

Condoms are the only form of contraception that reduces the risk of STIs and unintended pregnancies. To protect against STIs, always use a barrier, such as a condom, with a water-based lubricant for vaginal, anal or oral sex, or a dental dam for oral-vaginal or oral-anal sex.

To find out where you can get your free condoms and safe sex packs, visit Family Planning Australia's Freedom Condom project or Ending HIV.

Contraception

Some people may use additional contraception methods as well, which can include:

  • the pill, which is a small tablet taken every day that stops the ovaries from releasing an egg to prevent pregnancy
  • an intrauterine device (IUD), also known as the coil, is a small device inserted by a doctor into the uterus (womb) to prevent pregnancy
  • an implant, which is a small, flexible rod implanted under the skin (usually on the arm). It stays there for up to three years and releases a hormone called etonogestrel, which helps prevent pregnancy.
  • an injection (also known as Depo), which contains progestogen and prevents pregnancy for 12 weeks by stopping ovulation

Visit Family Planning Australia for more information.

Communication

Open and honest conversations about consent, condoms and contraceptives are key to safer and more enjoyable sexual experiences. Whether it’s a one-time encounter, a casual relationship, or a long-term partnership, clear communication helps protect everyone’s health. Talk with your partner about STIs, whether you’ll both get tested before having sex, and agree on condom use.

For more information, check out the Play Safe blog: 4 C’s of Safe Sex.

Preventing STIs with Doxy-PEP

Doxy-PEP means taking a dose of an antibiotic called doxycycline within 72 hours (3 days) after having sex (oral, anal, or vaginal). It can help protect against syphilis and chlamydia. Doxy-PEP is most helpful for people who have a higher chance of getting syphilis. This includes gay and bisexual men, and transgender women, especially if they have had syphilis or other STIs in the last year.

HIV prevention medications

HIV pre-exposure prophylaxis

HIV pre-exposure prophylaxis (PrEP) is a medication for people at high risk of getting HIV. It is very effective at preventing HIV, but it does not protect you from other STIs.

HIV post-exposure prophylaxis

HIV post-exposure prophylaxis (PEP) means taking HIV medication after you may have been exposed to the virus. This could be after sex, a work exposure, or another situation where HIV might have been passed on. HIV PEP helps lower the chance of getting HIV.

HIV PEP is most effective when started as soon as possible, ideally within 24 hours, and no later than 3 days after exposure. The medication should be taken for 28 days following the exposure. For more information about PEP, you can visit Get PEP Now or call 1800 PEP NOW (1800 737 669).

HIV treatment as prevention

When a person living with HIV takes their medication every day, the amount of virus in their blood becomes so low that it cannot be seen on a test. This is called an undetectable viral load. HIV is still in the body, but its ability to cause health issues is dramatically reduced. People with an undetectable viral load cannot pass on HIV through sex. This is sometimes called Undetectable=Untransmittable (U=U). If you have an undetectable viral load, you do not need to use condoms to prevent HIV. You still need condoms to protect yourself from other STIs.

To find out about U=U, HIV PrEP or HIV PEP, you can call healthdirect at 1800 022 222 (available 24 hours) or the NSW Sexual Health Infolink (SHIL) at 1800 451 624 (available from 9:00am to 5:30pm, Monday to Friday).

Sexual health check-up

A sexual health check-up is an opportunity for you to discuss any sexual health concerns you may have with a doctor, including concerns about STIs and HIV.

If you are sexually active, having a regular sexual health check-up is always a good idea. You don't need to have physical symptoms to undergo a sexual health check-up. To find out who you can visit for a sexual health check-up, go to Sexual health.


Current as at: Wednesday 3 December 2025
Contact page owner: Centre for Population Health