Can you get an STD from oral sex?

Yes. Oral sex is lower risk than vaginal or anal sex for HIV, but not for everything. CDC lists chlamydia, gonorrhoea, syphilis, herpes, HPV and HIV among the STIs that can be passed on through oral sex, and Planned Parenthood adds hepatitis B (CDC, About STI Risk and Oral Sex, 2024; Planned Parenthood). CDC also notes that oral sex involving the anus can transmit hepatitis A and B and some gut infections.

Infections can travel in both directions. According to CDC, you can get some STIs in the mouth or throat by giving oral sex to a partner with a genital or rectal infection, and on the genitals by receiving oral sex from a partner with a throat infection. It is possible to have an STI in more than one place at once, for example in the throat and the genitals.

For HIV, CDC rates the per-act risk from oral sex as low (CDC, HIV Risk and Prevention Estimates, 2024), and says the risk from oral sex with a partner who has HIV is much lower than from anal or vaginal sex. It adds that this may not be true for other STIs, and that activities are hard to compare because most people who have oral sex also have vaginal or anal sex. Planned Parenthood describes oral sex as lower risk, not no risk.

Barriers work for oral sex and are rarely used: in Dutch surveys of swingers, condom use for oral sex fell from 5% in 2011 to 2% in 2018 (Kampman and colleagues, PLOS One, 2020). CDC suggests a barrier every time: a non-lubricated latex condom on a penis, a polyurethane one if either partner is allergic to latex, and for oral sex on the vulva or anus, a dental dam or a condom cut open into a square. Planned Parenthood adds that a dam goes in place before any mouth-to-skin contact, that you need a new one each time, and that oil-based lubricants can make it break.

Many throat infections cause no symptoms, so how you feel is not a guide; CDC notes that many STIs are symptomless and can spread without signs. Some matter more in the throat than people expect: CDC says gonorrhoea in the throat can be harder to treat, and that certain types of HPV in the mouth and throat may develop into oral or neck cancer. A sore throat, sores or anything unusual after oral sex is a reason to see a clinician rather than to guess.

A urine sample tests the genitals, and the throat needs its own swab. CDC suggests that anyone who has had oral or anal sex ask a healthcare provider about throat and rectal testing options (CDC, Getting Tested for STIs, 2026). Its clinical guidance recommends throat screening for gonorrhoea at least yearly for gay and bisexual men, and says throat screening can be considered for women based on their sexual behaviour (CDC STI Treatment Guidelines, screening recommendations). If you have oral sex with new partners, say so when you book.

In the lifestyle, oral sex is often treated as the casual part of an evening, which is exactly why it belongs in your agreements. Carry dental dams and non-lubricated condoms with the rest of your supplies, say what you use before anything starts, and include oral sex when you and a new partner talk about testing. This is general information, not medical advice; the JoinTheSwing play-safe guide and STD testing guide cover the rest.