Sexual Health Myths vs Facts: What's Actually True About STIs

There are a lot of myths floating around about sexually transmitted infections (STIs) — and some of them are genuinely risky, because they stop people testing, treating, or talking openly. Not everyone has access to inclusive, non-judgemental sexual healthcare, and stigma only makes it harder to get good information. So let's separate fact from fiction.

Most of these myths share a root cause: shame and misinformation rather than science. Clearing them up makes it far easier to look after yourself and the people you connect with. Here are the big ones.

Myth: You can "tell" if someone has an STI

False. You usually can't tell if someone has an infection. Visible signs like sores or unusual discharge can point to an STI, but most infections have no symptoms at all — which is exactly why they spread.

The only way to know your status is to get tested. A routine test often covers chlamydia, gonorrhoea, syphilis, and HIV, and may include urine samples, blood samples, and swabs depending on the kinds of sex you have (including throat and anal swabs after oral or anal play). Bear in mind the window period too — the gap between picking up an infection and it showing on a test. It's roughly two weeks for chlamydia and gonorrhoea, and around four to six weeks for HIV and syphilis, so very recent exposures may not show up straight away.

The only way to know your STI status is to test for it — you can't tell by looking, and neither can a partner.

Myth: Only people who have a lot of sex get STIs

Anyone who is sexually active can get an STI, no matter how many partners they've had. Infections don't discriminate based on "body count" — they can happen whether you've only ever had long-term partners or more casual encounters. Whether you're monogamous, monogamish, or have multiple partners, testing (and treatment, if you need it) is simply part of looking after your health.

Myth: STIs are something to be terrified of

STIs don't have to be scary. In most respects they're like any other common infection — the real difference is the stigma attached to them. Depending on your body and what you're comfortable with, you can lower your risk with tools like condoms, dental dams, vaccinations, HIV PrEP, and DoxyPEP. And if you do pick something up, most STIs are straightforward to treat: make an appointment with your GP or a local sexual health clinic, or drop in during walk-in hours, and talk through your options.

Myth: Only certain people are "high risk" for HIV

Nobody is automatically "high risk" based on their identity. Your level of risk comes from the anatomy you and your partners have and the kinds of sex you're having — not from labels. Condomless anal sex carries the highest risk of HIV transmission, followed by vaginal sex; oral sex is very low risk. If you think you may be at higher risk now or in future, PrEP is an HIV-prevention tool that works across identities. Organisations like PrEPster have clear, free information on how it works.

Myth: If I use condoms, I don't need to get tested

Condoms are a great way to prevent HIV and many STIs, but using them alongside regular testing gives you the most accurate picture. Part of the reason is oral sex: if you only use condoms for vaginal or anal sex, infections can still pass to or from the mouth and throat. If you've given oral sex, it's worth including an oral swab in your next check-up. Condoms can also fail occasionally if they're used or removed incorrectly — so regular, comprehensive testing keeps you informed either way.

Myth: Everyone should get tested for herpes

This one's a little more nuanced — in most cases, no. If you have symptoms like blisters in the genital area, see a clinician: they can often diagnose herpes on sight and confirm it with a swab. Without symptoms, there's usually no need for a test, even if a partner has told you they have genital herpes — if symptoms are going to appear, they typically do within about two weeks. Blood tests for the virus exist, but most clinics won't offer them without symptoms: herpes is extremely common and often symptomless, and the blood test can't tell where on the body the infection is, so it isn't very reliable.

Myth: You can't get an STI while on DoxyPEP

Not quite. DoxyPEP (Doxycycline Post-Exposure Prophylaxis) means taking the antibiotic doxycycline after sex to help prevent syphilis, chlamydia, and — to a lesser extent — gonorrhoea. It's highly effective against chlamydia and syphilis, but no method is 100%, and it's weaker against gonorrhoea. Because STIs are often symptomless, DoxyPEP works best combined with regular testing, ideally every three months.

Myth: HIV is a death sentence

False. People living with HIV can live long, healthy lives. Someone diagnosed today who starts treatment promptly can expect a normal lifespan. Modern treatment can suppress the virus so effectively that it becomes "undetectable" — and at that point it can't be passed on through sex. This is often summarised as U=U: Undetectable = Untransmittable, and reaching it also protects long-term health.

Myth: "Pulling out" prevents STIs

It doesn't — and it isn't a reliable way to prevent pregnancy either. Infections can pass through fluids like pre-ejaculate, vaginal fluid, or anal fluid without ejaculation. If you'd rather not use condoms but want to prevent HIV, PrEP is an option if you're HIV-negative; and if a partner is living with HIV and is undetectable, they can't transmit it through sex. DoxyPEP may help reduce the risk of bacterial STIs during condomless sex.

Myth: If I've been treated for an STI once, I can't get it again

Unfortunately not. Being successfully treated doesn't protect you from catching the same infection — or a different one — in future. After treatment, a clinic may ask you back for a test to confirm it worked, and then you can return to a regular testing rhythm. Prevention tools like condoms and DoxyPEP help reduce repeat infections. A few STIs, such as genital herpes and genital warts, can't be cured, but their symptoms can be managed, and flare-ups may be rare or years apart.

Where Zults comes in

Once you've cut through the myths, the practical stuff gets easier — and part of that is being able to share your status without the awkwardness. Zults turns the STI results you already have into a verified, shareable Rezults card: a partner can trust it's genuinely yours and current, you can hide your legal name while still proving it's you, and you can revoke access at any time. It's a calmer alternative to a screenshot, which can be edited and can't be taken back. If you want the bigger picture, our guide to prioritising sexual health and safety ties it all together.

The bottom line

Most sexual-health myths come from stigma, not science — and believing them is what actually puts people at risk. The facts are more reassuring than the fiction: STIs are common, usually treatable or manageable, and knowable through regular testing. Stay informed, test regularly, and lead with care.

Educational information only — not medical advice. Testing recommendations, window periods, and prevention options vary by person and country; for guidance about your own sexual health, speak to a qualified clinician or your local sexual health service.