Genital warts spread through skin-to-skin contact with someone who carries the human papillomavirus (HPV), most often during vaginal, anal, or oral sex. More than 90% of genital wart cases are caused by two specific low-risk strains of HPV: types 6 and 11. The virus enters through tiny breaks in the skin’s surface, infecting the deepest layer of cells, where it can remain undetected for weeks or months before warts appear.
How HPV Spreads During Sexual Contact
The most common route is direct genital contact during sex. Penetrative intercourse is not required. HPV can spread through any skin-to-skin touching of the genital area, including hand-to-genital contact, genital-to-genital rubbing, and oral sex. About 40 strains of HPV spread through direct sexual contact to the genital area, mouth, and throat. The two strains responsible for nearly all genital warts (types 6 and 11) follow the same pattern.
Because the virus lives in skin cells rather than in bodily fluids, condoms reduce risk but don’t eliminate it. Condoms only cover part of the genital area, leaving surrounding skin exposed. The CDC notes that HPV can be transmitted through contact with infected skin or mucosal surfaces not covered by a condom. That said, consistent condom use still offers meaningful protection: it lowers the risk of genital warts and helps the body clear existing HPV infections faster.
Can You Get Genital Warts Without Sex?
It’s uncommon, but possible. Certain HPV strains can spread through contact with contaminated surfaces like shared towels or in environments like public showers. This route is far less common than sexual transmission, and the specific risk for genital wart strains through surfaces is not well quantified.
HPV can also pass from a mother to her baby during childbirth. This is rare, and when it does happen, the infant’s immune system typically clears the virus on its own or with minimal medical help.
Why Warts Don’t Appear Right Away
One of the trickiest things about genital warts is the delay between infection and visible symptoms. After exposure to HPV, warts typically appear within one to six months. Some people carry the virus for much longer without ever developing visible warts, which means you can spread HPV without knowing you have it. There is no reliable way to pinpoint exactly when or from whom you contracted the virus, which often causes confusion for people in relationships.
It’s also worth knowing that most HPV infections never cause warts at all. About 90% of genital HPV infections in women clear on their own within two years as the immune system suppresses the virus. Many people are infected, transmit the virus, and never see a single wart.
Who Is More Likely to Develop Warts
Exposure to HPV is extremely common, but certain factors make it more likely that the virus will take hold and produce visible warts rather than being cleared quietly by the immune system.
- Multiple sexual partners. More partners means more chances for exposure to different HPV strains.
- Becoming sexually active at a young age. People who begin having sex before age 18 face a higher likelihood of HPV infection.
- A weakened immune system. Conditions or medications that suppress immune function make it harder for the body to fight off HPV. Infections are more likely to persist and cause symptoms in immunocompromised people.
- Smoking. Tobacco use is linked to reduced immune function in the genital area, making it harder for the body to suppress HPV.
None of these factors guarantee you’ll develop warts. They simply shift the odds. A person with a strong immune system can be exposed to HPV types 6 or 11 and never know it.
How Vaccination Changes the Picture
The HPV vaccine (Gardasil 9) protects against both HPV 6 and HPV 11, the strains behind the vast majority of genital warts. In clinical trials, the vaccine was 99% effective at preventing genital warts in people who had not already been exposed to those strains. That near-perfect efficacy makes vaccination the single most effective way to avoid genital warts.
The vaccine works best when given before any HPV exposure, which is why it’s routinely recommended starting at age 11 or 12. But it’s approved for people up to age 45, and even those who have already been exposed to one HPV strain can benefit from protection against the others. If you’ve already had genital warts, the vaccine won’t treat an existing infection, but it can still protect you against strains you haven’t encountered yet.
What Genital Warts Look and Feel Like
Genital warts usually appear as small, flesh-colored or slightly darker bumps in the genital or anal area. They can be flat or raised, single or clustered. When multiple warts group together, they sometimes resemble a cauliflower shape. They’re typically painless, though some people experience mild itching. Warts can appear on the vulva, vaginal walls, cervix, penis, scrotum, groin, thighs, or around the anus.
Because the incubation period ranges from one to six months (and sometimes longer), warts may appear long after the sexual contact that caused the infection. If you notice unfamiliar bumps in the genital area, a healthcare provider can usually diagnose genital warts with a visual exam.
Reducing Your Risk
Vaccination before exposure is the most effective prevention. Beyond that, consistent condom use lowers the risk, though it can’t eliminate it completely because HPV infects skin that condoms don’t cover. Limiting your number of sexual partners reduces the probability of encountering the virus. And because HPV is so common, being in a mutually monogamous relationship with someone who has had few prior partners also lowers exposure risk.
There is no routine screening test for genital warts or for the low-risk HPV strains that cause them. Unlike high-risk HPV strains (which are screened for during cervical cancer checks), types 6 and 11 are only detected when warts become visible. This makes prevention through vaccination and safer sex practices especially important.