16 Common STD Myths and Facts You Need to Know

16 STD Myths, Debunked by Sexual Health Doctors

Misinformation about sexually transmitted infections (STIs) spreads almost as easily as the infections themselves — and it can do real harm. When people believe inaccurate information about how STIs are transmitted, they may take unnecessary risks, delay testing, or avoid people and situations that pose no actual risk.

At PULSE Clinic, we see the consequences of these myths every day: people who delayed testing because they had "no symptoms" or who assumed a healthy-looking partner meant there was no risk of infection. Below, we separate fact from fiction on 16 common STD myths so that you can make informed decisions about your sexual health.

Myth 1: STIs Can Spread Through Sharing Food or Utensils

The Fact: No. STIs are not spread through sharing food, eating utensils, toilet seats, or swimming pools.

Most STIs require specific types of sexual or intimate contact to spread and are not transmitted through ordinary everyday contact. While some infections can survive outside the body for a limited time, casual contact with surfaces or shared household items is not a typical route of STI transmission.

Myth 2: You Can Catch an STD From a Toilet Seat

The Fact: No. STIs are not normally transmitted through toilet seats.

This is one of the most persistent myths about sexual health. The infections commonly classified as STIs are generally spread through sexual contact, including contact with infected bodily fluids, mucous membranes, genital skin, or sores and lesions.

Simply sitting on a toilet seat does not put you at meaningful risk of contracting an STI.

Myth 3: Only Certain "Types" of People Get STDs

The Fact: STIs do not discriminate. STIs can affect people of any age, background, profession, relationship status, or sexual orientation.

Anyone who has sexual or intimate physical contact can potentially be exposed, although the level of risk varies depending on the infection and type of contact. Condoms can substantially reduce the risk of many STIs when used correctly and consistently. Other prevention methods, such as vaccination, regular testing, and HIV prevention medication such as PrEP, also play a crucial role in reducing sexual health risks.

Myth 4: STIs Can't Be Transmitted Through Kissing

The Fact: Some STIs can be transmitted through kissing.

Kissing generally carries little risk for most STIs. However, some infections, including herpes and syphilis, can sometimes be transmitted through kissing, particularly when infectious sores or lesions are present around the mouth. While kissing is not a common transmission route for most STIs, risk depends on the specific infection and whether direct contact occurs with an active lesion.

Myth 5: You'll Be Able to Tell If Your Partner Has an STD

The Fact: Many STIs cause no noticeable symptoms at all.

You cannot reliably tell whether someone has an STI simply by looking at them. Many infections cause no symptoms, or symptoms may be mild enough to go unnoticed (asymptomatic infections). Left untreated, asymptomatic STIs can lead to complications such as pelvic inflammatory disease (PID) and infertility.

Clinical Guidance: If you are sexually active, schedule regular STI screenings based on your personal risk profile. Testing with a partner before starting a new sexual relationship provides mutual peace of mind.

PCR31 STD Screening at PULSE Clinic

For people who want comprehensive STI screening, PCR31 is a molecular testing panel designed to screen for 31 sexually transmitted infections in one test. It can be an option for people who want broader screening, particularly when there are no obvious symptoms, but there is a concern about possible exposure.

• Prices are in Thai baht.
• Online results will be available at the PULSE Online Portal (POP) and the E-Doc mobile application
• For same-day result testing, the sample must be taken at the clinic before 12:30 PM.
• Same-day and next-day results are only available at the Bangkok, Pattaya, and Phuket branches

Contact us at info.bkk@pulse-clinic.com or chat on your preferred platform:

Myth 6: You Can Only Be Infected With One STI at a Time

The Fact: You can have more than one STI at once.

Having one STI does not protect you from another infection. In fact, some STIs cause localised inflammation that can increase your susceptibility to acquiring secondary infections. If you are diagnosed with an STI, clinicians typically recommend a broader screening panel to identify co-infections that might otherwise go undetected.

Myth 7: Oral or Anal Sex Won't Give You an STD

The Fact: STIs can be transmitted through oral, anal, and vaginal sex.

Infections such as gonorrhoea, chlamydia, syphilis, herpes, HPV, and HIV can be transmitted through sexual contact involving the mouth, throat, anus, or genitals. Some infections also spread through direct skin-to-skin contact with an infected area, even when there are no visible sores or obvious symptoms.

Myth 8: Once You've Had an STD, You Can't Get It Again

The Fact: Many bacterial STIs can be acquired again after successful treatment.

Being infected with an STI does not provide lifelong immunity. Bacterial infections like chlamydia, gonorrhoea, and syphilis can be cured with appropriate treatment, but re-exposure will result in reinfection. Viral infections like HIV and herpes have no cure, but effective medical management controls the virus and minimises transmission risks.

Clinical Guidance: Follow your clinician’s treatment instructions, abstain from sexual contact until advised it is safe, and ensure recent partners are notified and treated concurrently.

Myth 9: Being Treated Once Makes You Immune

The Fact: No, Treatment clears a specific current infection; it does not provide immunity against future exposure.

Even after an STI has been successfully treated and cleared, you can become reinfected if exposed again. This is why ongoing prevention, regular testing, and partner management remain essential after completing treatment.

Myth 10: All Birth Control Methods Protect Against STDs

The Fact: Most forms of contraception offer zero protection against STIs!

Hormonal contraception—including the pill, implants, injections, and hormonal IUDs—is designed solely to prevent pregnancy.

Condoms remain the primary barrier method capable of significantly reducing STI transmission alongside pregnancy prevention. Additional protective measures include HPV and Hepatitis B vaccinations, HIV PrEP, and routine screening.

Myth 11: Condoms Are 100% Effective Against STDs

The Fact: Condoms significantly reduce risk, but no single method is 100% foolproof!

When used correctly and consistently, condoms are highly effective against fluid-transmitted STIs. However, they do not cover all genital or surrounding skin.

Infections transmitted via skin-to-skin contact (herpes, HPV, syphilis) can still pass through exposed areas. Combining condom use with vaccination and routine testing provides the most comprehensive protection.

Read more: What to do if your condom breaks

Myth 12: Wearing Two Condoms Is Safer Than One

The Fact: No, using two condoms at once increases the risk of breakage!

Wearing two external condoms simultaneously creates friction between latex layers, making tearing or slipping far more likely. The same friction risk applies when pairing an external condom with an internal condom. Always use a single condom correctly.

Myth 13: STIs Are Genetic and Can Be Inherited

The Fact: STIs are acquired infections, not genetic traits!

STIs are not inherited through genes. However, vertical transmission (parent-to-child) can occur during pregnancy, childbirth, or breastfeeding if an infection remains untreated. Routine prenatal STI screening and medical care significantly lower the risk of passing infections to a newborn.

Myth 14: Chlorine or Hot Tubs Kill STDs

The Fact: Swimming pools and hot tubs do not protect against STIs!

Chlorinated or heated water does not eliminate the risk of transmission during sexual activity. Furthermore, exposure to water and heat can weaken latex condoms or cause them to slip off, making them less reliable.

Myth 15: You Don't Need to Worry About STDs in a Relationship

The Fact: Being in a relationship does not automatically eliminate STI risk!

Many STIs remain dormant in the body for years without noticeable symptoms, meaning a partner could unknowingly carry an infection from a past relationship. Open communication, mutual screening, and clear sexual health discussions are vital steps for long-term partners.

Myth 16: You Can Only Catch Herpes During an Active Outbreak

The Fact: Herpes can be transmitted when no visible symptoms are present.

Through a mechanism known as asymptomatic viral shedding, the herpes simplex virus can be active on the skin and contagious even in the absence of visible sores or blisters.

The Bottom Line

Most STIs do not announce themselves. You cannot reliably judge someone's STI status based on physical appearance, relationship status, or the absence of symptoms.

The best approach is to understand how different infections spread, use appropriate prevention methods, communicate openly with sexual partners, and undergo regular clinical screening.

PULSE Clinic offers confidential STI testing and treatment, backed by experienced sexual health doctors. If you have questions about your sexual health, symptoms, or potential exposure, our clinical team is here to provide discreet, non-judgemental care.

Contact us at info.bkk@pulse-clinic.com or chat on your preferred platform: