BV and Sex: Transmission, Partners and What to Avoid
Whether you can have sex with BV, whether partners need treating, and what changed in 2025.
Part of the Bacterial Vaginosis condition guide.
Key fact: BV is not classed as a sexually transmitted infection — but sex clearly influences it, and 2025 evidence on treating male partners has made that relationship harder to dismiss than it used to be.
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Start a BV consultation →Can you have sex with BV?
Medically, yes. BV is not dangerous to a partner in the way an untreated sexually transmitted infection is, and there is no clinical rule requiring abstinence.
In practice, most women choose to wait, and for good reasons rather than squeamish ones:
- Unprotected sex makes the odour worse. Semen is alkaline and raises vaginal pH for several hours, releasing a burst of the amines responsible for the smell.
- Sex displaces vaginal treatments. If you are using Zidoval gel or Dalacin cream, sex reduces how much stays in contact with the vaginal wall.
- Barrier protection may not be available. Dalacin 2% cream weakens latex, so condoms cannot be relied upon during that course.
- Courses are short. Five to seven nights is a manageable wait, and it removes the guesswork about whether treatment is working.
On feeling self-conscious. BV is extremely common — roughly one in three women are affected at some point — and it is not a consequence of poor hygiene. If anything, over-washing and douching make it more likely, not less. The condition is a shift in bacterial balance, not a cleanliness failure.
Is BV a sexually transmitted infection?
UK guidance does not classify BV as a sexually transmitted infection, and that classification rests on solid ground: women who have never had penetrative sex can develop BV, and it is not caused by a single transmissible pathogen but by a shift in an entire microbial community.
At the same time, the sexual associations are strong and consistent. BV is more common in women with new partners, with multiple partners, and among women who have sex with women. Concordance between partners has been repeatedly documented. For years the standard position was that these associations reflected disruption rather than transmission — that sex perturbs the microbiome without passing anything on.
That position is now genuinely contested. A randomised trial published in the New England Journal of Medicine in March 2025 found BV recurrence in 35% of women whose male partner was also treated, compared with 63% when only the woman was treated. The trial was stopped early because treating the woman alone was clearly inferior. That result is difficult to explain without some form of transmission between partners.
What that means for you today is more limited than the headline suggests. One trial, in monogamous heterosexual couples, in one country, does not change UK guidance on its own — and NICE still states that partner treatment is not routinely needed. But it is a reasonable thing to raise with a clinician if you have recurrent episodes. The full picture, including the trial detail, is in our guide to recurrent BV.
Male partners
Men do not get BV. They have no vaginal microbiome, so the condition as such cannot occur.
What men can do is carry BV-associated organisms, on penile skin and in the urethra, without any symptoms at all. That carriage is asymptomatic and harmless to them, which is why it went largely unexamined for so long — and it is exactly the reservoir the 2025 trial targeted, using oral metronidazole plus a topical clindamycin cream applied to penile skin for seven days.
| Question | Current UK position |
|---|---|
| Can a male partner catch BV? | No — men cannot develop BV |
| Can he carry the organisms? | Yes, asymptomatically |
| Is partner treatment routine in the UK? | No — NICE states it is not routinely needed |
| Is that under review? | Yes — the March 2025 NEJM trial is a significant challenge to it |
| What should I do? | Raise it with a clinician if episodes keep recurring; do not arrange treatment for him yourself |
Please do not treat a partner informally. Sharing your antibiotics, or ordering a course for someone who has not been assessed, is unsafe and contributes to resistance. If partner treatment is appropriate for you, it should be arranged through a clinician who has assessed you both.
Female partners
BV is substantially more common among women who have sex with women, and concordance between female partners — both having BV at the same time — is well documented.
Plausible routes include shared sex toys used without cleaning or barriers, and direct exchange of vaginal fluid. The evidence base here is thinner than for heterosexual couples, largely because it has been studied less, which is itself worth naming.
Clean shared toys
Wash between uses and between partners, or use a fresh condom on the toy for each person.
Consider barriers
Dental dams and gloves reduce exchange of vaginal fluid, though evidence specific to BV prevention is limited.
Both get assessed
If you and your partner both have symptoms, both being assessed is more useful than one being treated repeatedly.
Say so at consultation
Mention the pattern when you consult. It genuinely affects how recurrence is interpreted.
Sex during treatment
The advice differs slightly depending on which treatment you are using, which is a detail often left out.
| Treatment | Sex during the course | Barrier contraception |
|---|---|---|
| Metronidazole tablets | No specific restriction | Latex unaffected |
| Zidoval vaginal gel | Best avoided — can displace the gel | Latex unaffected |
| Dalacin 2% cream | Best avoided | Latex weakened during the course and for 5 days after |
The Dalacin point is the one that matters most. Clindamycin cream damages latex condoms and diaphragms, so they cannot be relied on for contraception or for protection against sexually transmitted infections during the seven-night course or for five days afterwards. Use a non-latex alternative or another method. Full detail is in our Dalacin guide.
There is no requirement to wait until symptoms have fully resolved before resuming sex, and no need to wait a set number of days after finishing. For what to expect as symptoms settle, see how long BV takes to clear up.
Condoms, lubricants and toys
A few practical points that come up repeatedly and that have reasonable evidence behind them.
- Consistent condom use is associated with less BV and less recurrence. The likely mechanism is preventing the alkaline pH shift caused by semen.
- Lubricants vary in pH. Some are considerably more alkaline than the vagina. If you use lubricant often and get frequent BV, trying a pH-balanced product is a low-cost experiment.
- Do not douche after sex. It is a common instinct when odour is the concern, and it makes recurrence more likely rather than less.
- Wash toys between uses and between partners, or use a fresh condom on them each time.
- Skip scented products entirely — intimate washes, wipes and deodorants all disturb vaginal pH.
New partners and why symptoms follow them
A new sexual partner is among the most consistently identified risk factors for BV. The pattern of an episode appearing a few weeks after a new relationship begins is common enough that many women notice it themselves.
The likely explanation is that the vaginal microbiome is disrupted by exposure to a new partner's genital flora, and takes time to re-establish a stable lactobacilli-dominant state. This is not a judgement about anyone's behaviour, and it is not evidence that either person did anything wrong.
If your episodes cluster around new partners, that is useful information rather than an embarrassment — it points towards condom use as a prevention strategy and helps a clinician interpret a recurrent pattern. Tracking it is one of the recommendations in our recurrent BV guide.
Get a sexual health screen if you have a new partner and changed discharge. BV does not protect you from anything else, and chlamydia, gonorrhoea and trichomoniasis often produce few or no symptoms. A pH self-test does not screen for these — see how to test for BV at home for what home testing can and cannot cover.
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Start a BV consultation →Frequently Asked Questions
Can you have sex with BV?
There is no medical prohibition on having sex with BV. It is not dangerous to a partner in the way an untreated sexually transmitted infection is. Many women prefer to wait because unprotected sex temporarily worsens the odour, and because sex can displace vaginal treatments.
Is BV classed as a sexually transmitted infection?
No. UK guidance does not classify BV as a sexually transmitted infection, and women who have never had sex can develop it. Sexual activity clearly influences it, though, and 2025 evidence on partner treatment has reopened the question of how much transmission contributes.
Can I pass BV to my male partner?
Men do not develop BV, because they do not have a vaginal microbiome. BV-associated organisms can be carried on penile skin and in the urethra without causing symptoms, which is the mechanism behind the 2025 partner-treatment findings.
Can BV be passed between female partners?
BV is notably more common among women who have sex with women, and concordance between female partners is well documented. Sharing sex toys without cleaning or barriers is one plausible route. Both partners having symptoms assessed is sensible.
Should I avoid sex during BV treatment?
It is generally advised rather than required. Sex can reduce how much vaginal gel or cream stays in place, and unprotected sex raises vaginal pH, which works against the treatment. Given courses are only five to seven nights, waiting is usually simplest.
Do condoms help prevent BV?
Consistent condom use is associated with a lower rate of BV and of recurrence, probably because it prevents the alkaline pH shift caused by semen. Note that Dalacin 2% cream weakens latex, so condoms cannot be relied on during that particular course.
Why does my BV come back after sex with a new partner?
A new sexual partner is one of the most consistently identified risk factors for BV, alongside multiple partners. The vaginal microbiome appears to be disrupted by exposure to a new partner's genital flora, and it may take time to re-establish.
Completing the treatment
Access Doctor supplies BV treatment following an online consultation with a pharmacist independent prescriber, in plain packaging. If your episodes follow a pattern around sex or new partners, mention it — it changes how we interpret recurrence.
Bacterial vaginosis · Rx
Metronidazole 400mg Tablets
First-line oral antibiotic for BV, with no effect on latex condoms.
View product →Bacterial vaginosis · Rx
Zidoval Vaginal Gel
Metronidazole 0.75% gel applied nightly for five nights — latex-safe.
View product →Bacterial vaginosis · Rx
Dalacin 2% Cream
Clindamycin vaginal cream — weakens latex for five days after the course.
View product →Self-test · Pharmacy
Canestest Self-Test
Checks vaginal pH at home. Does not screen for sexually transmitted infections.
View product →References
- Vodstrcil LA, Plummer EL, Fairley CK, et al. Male-Partner Treatment to Prevent Recurrence of Bacterial Vaginosis. New England Journal of Medicine, 2025. nejm.org
- National Institute for Health and Care Excellence. Clinical Knowledge Summaries: Bacterial vaginosis. 2025. cks.nice.org.uk
- British Association for Sexual Health and HIV. National guideline for the management of vaginal discharge. bashh.org
- Electronic Medicines Compendium. Dalacin 2% Cream — Summary of Product Characteristics. medicines.org.uk
- NHS. Bacterial vaginosis. nhs.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.