Men don’t get bacterial vaginosis themselves, but they can carry the same bacteria on their penis. Current CDC guidelines state that male sex partners of women with BV do not need treatment. That said, the relationship between male partners and recurring BV is more complicated than that one-line recommendation suggests, and it’s worth understanding why.
Why Men Don’t “Get” BV
Bacterial vaginosis is a condition specific to the vaginal environment. It happens when the balance of bacteria inside the vagina shifts, with normally dominant protective bacteria losing ground to other organisms. The vagina has a unique, delicately balanced microbiome that can tip into this overgrowth pattern. Men simply don’t have the anatomy for that to occur.
That doesn’t mean the bacteria involved are absent from men’s bodies. BV-associated bacteria, particularly one called Gardnerella vaginalis, can be identified on male genitalia. These organisms colonize the skin of the penis, especially under the foreskin in uncircumcised men. Most of the time, men carrying these bacteria have zero symptoms and no idea they’re there.
Can BV Bacteria Cause Symptoms in Men?
In rare cases, the bacteria linked to BV may contribute to balanitis, an inflammation of the head of the penis. Symptoms of balanitis include redness or discoloration, swelling, itching under the foreskin, a bad smell, and sometimes a white, cheesy-looking discharge. It can also cause a burning sensation while urinating. Balanitis has many possible causes, from yeast infections to poor hygiene to skin conditions, so the presence of BV-related bacteria is just one possibility among several.
If you’re experiencing any of those symptoms, a healthcare provider can swab the head of the penis or the urethral opening to check for infections. But routine testing of men for BV bacteria when they have no symptoms isn’t standard practice, because there’s no established condition in men that it would diagnose.
Why Treating Male Partners Hasn’t Worked
The intuitive logic seems straightforward: if a man carries BV bacteria and passes them back during sex, treating him with antibiotics should help prevent his partner’s BV from coming back. Researchers have tested this idea multiple times, and the results have been consistently disappointing.
A meta-analysis pooling six randomized controlled trials with 953 couples found no significant reduction in BV recurrence when male partners were treated compared to standard female-only therapy. The numbers were essentially a wash. When the analysis was limited to studies using a single antibiotic for the male partner (either oral or topical, but not both), heterogeneity between studies dropped to zero and the effect remained neutral.
One trial did try a combined approach, giving male partners both an oral antibiotic and a topical penile antibiotic simultaneously. That study showed more promising results, but it was a single trial and not enough to change clinical recommendations on its own. Researchers noted that antibiotic treatment did have an immediate effect on the composition of bacteria on the penis, but by day 28 the changes were far less pronounced. The bacteria appear to recolonize relatively quickly.
This is why the CDC’s current position remains unchanged: male sex partners of women with BV do not need treatment.
What Men Can Actually Do
Even though antibiotics for men aren’t recommended, that doesn’t mean male partners play no role. BV recurrence is frustratingly common, and sexual activity is a well-established risk factor. There are practical steps that may help.
- Use condoms consistently. Condoms create a barrier that limits the exchange of bacteria between partners. For couples dealing with recurrent BV, consistent condom use during vaginal sex is one of the few interventions with supporting evidence.
- Practice good genital hygiene. Washing the penis daily with warm water, and gently cleaning under the foreskin if uncircumcised, reduces the bacterial load on the skin. Avoid heavily fragranced soaps, which can irritate skin and potentially disrupt the microbiome of both partners.
- Avoid sex during treatment. If your partner is being treated for BV, abstaining from unprotected vaginal sex until she completes her course of treatment reduces the chance of reintroducing bacteria before her vaginal microbiome has stabilized.
The Bigger Picture on Recurrence
BV comes back within 12 months for roughly half of women who are treated. That high recurrence rate is what drives the search for additional strategies, including male partner treatment. The fact that treating men with a single antibiotic hasn’t helped suggests the problem is more complex than simple bacterial ping-pong between partners. The vaginal microbiome can be disrupted by hormonal changes, douching, new sexual partners, and factors researchers still don’t fully understand.
If your partner keeps getting BV and you’re wondering what you can do, the honest answer is that the most impactful steps are the simple ones: condoms, hygiene, and supporting her in completing treatment without reintroducing bacteria during the process. The combined oral-plus-topical approach for men is an area of active interest, but it hasn’t reached the point where doctors are prescribing it as standard care.