Gonorrhea spreads through vaginal, anal, or oral sex with an infected partner. The bacteria that causes it, called Neisseria gonorrhoeae, infects mucous membranes in the genitals, rectum, throat, and eyes. Ejaculation does not need to occur for transmission, and many people who carry the infection have no symptoms, making unknowing spread common.
How the Bacteria Gets In
Gonorrhea bacteria are highly specialized. They attach to the thin, moist tissue (mucous membranes) lining the urethra, cervix, rectum, throat, and eyes using tiny hair-like structures on their surface. These structures pull the bacteria tight against your cells, allowing colonization to begin. This is why gonorrhea only spreads through direct contact with these specific tissues. It cannot infect intact, dry skin like the forearm or leg.
Transmission During Vaginal and Anal Sex
Vaginal and anal sex are the most efficient routes of spread. Early research estimated that a single act of vaginal sex with an infected man transmits the bacteria to a female partner roughly 75% of the time. Transmission in the other direction, from an infected woman to a male partner, is lower at about 22% per encounter. These numbers help explain why, even with fewer total exposures, gonorrhea can spread quickly through a sexual network.
Anal sex carries a similar risk. The lining of the rectum is a mucous membrane well suited for bacterial colonization, and rectal infections are overwhelmingly asymptomatic. Because people with rectal gonorrhea rarely know they have it, they often go untreated for longer periods and continue to pass the infection to partners.
Oral Sex and Throat Infections
Gonorrhea can infect the throat through oral sex, typically when performing oral sex on an infected partner’s genitals. Pharyngeal (throat) gonorrhea is almost always asymptomatic. Most people with it never develop a sore throat or any noticeable sign, so they don’t seek testing or treatment. Research from the CDC found that the majority of throat and rectal infections were not associated with a urethral infection at all, meaning someone could carry the bacteria only in their throat and have no genital symptoms to prompt a visit to a clinic.
Why Asymptomatic Carriers Drive Spread
One of the most important things to understand about gonorrhea transmission is how often it spreads from people who feel perfectly fine. About half of women with genital gonorrhea have no symptoms. Among men, urethral infections are symptomatic 96% of the time, which is why men with penile discharge or burning tend to get tested quickly. But infections in the throat and rectum tell a different story: most are silent.
This creates a pattern where symptomatic urethral infections get treated promptly, while throat and rectal infections persist for weeks or months. The longer someone carries the bacteria without treatment, the more opportunities there are for transmission. CDC researchers have identified this dynamic as a primary driver of gonorrhea’s ongoing spread, particularly among men who have sex with men.
Transmission to Newborns
A pregnant person with an untreated cervical infection can pass gonorrhea to their baby during vaginal delivery. The baby’s eyes are the most vulnerable point of contact. This condition, called ophthalmia neonatorum, can lead to serious eye damage, including perforation of the eye and blindness if untreated. Less commonly, newborns can develop infections of the joints, blood, or brain lining. This is why newborns routinely receive antibiotic eye drops shortly after birth in most hospitals.
Self-Inoculation and Shared Sex Toys
You can spread gonorrhea from one part of your own body to another. The most common example is touching infected genital discharge and then touching your eyes, causing gonococcal conjunctivitis. Case reports document patients who developed severe eye infections this way, initially unaware they had a genital infection. Washing your hands after touching your genitals is a simple and effective precaution.
Shared sex toys are another potential route. If a toy contacts infected mucous membranes and is then used by another person (or on a different body part) without cleaning, bacteria can transfer. Using a toy vaginally and then anally, for instance, could give you a rectal infection. Nonporous toys made of materials like silicone or stainless steel can be fully cleaned with gentle soap and water or a water-based toy cleaner. Porous materials like rubber or jelly have microscopic holes that trap bacteria even after washing, so they should not be shared between partners. Placing a condom over the toy and switching to a fresh condom between partners or body areas eliminates most of the risk.
What Doesn’t Spread Gonorrhea
Gonorrhea bacteria are fragile outside the human body. Lab studies have shown that the bacteria can survive up to 24 hours on surfaces like glass or towels at room temperature, and longer under refrigerated conditions. But survival on a surface is not the same as transmission. The bacteria need direct contact with a mucous membrane in sufficient quantity to establish infection. Toilet seats, doorknobs, swimming pools, and casual contact like hugging or sharing food do not spread gonorrhea in real-world conditions.
How Condoms Reduce Risk
Consistent, correct condom use offers strong protection. Studies estimate that male condoms reduce the risk of gonorrhea transmission by more than 90% when used every time. Some real-world studies, which account for inconsistent use and human error, have shown risk reductions in the range of 49 to 75%. The gap between those numbers reflects what happens in practice: condoms work extremely well when used correctly for the entire sexual encounter, but protection drops when they’re applied late, removed early, or used only sometimes.
For oral sex, dental dams or condoms provide a barrier, though they are used far less consistently in practice. Regular screening remains one of the most effective tools for catching and stopping asymptomatic infections before they spread further. In the U.S., over 543,000 gonorrhea cases were reported in 2024, though the true number is likely higher given how many infections go undiagnosed.