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Sometimes vaginas go bad. Bad vag usually means a bad smell or an unpleasant vaginal taste that turns up suddenly, creeps in over time, or has always been there. If your girlfriend’s vagina smells off and you’re the one who noticed, you’re not being shallow for wanting to help her sort it. Most of the time the cause is a shift in the vaginal microbiome, which is very treatable once you know what you’re dealing with.
You’ll have all sorts of relationships with the people you might need to share this slightly awkward information with, from someone you just met to someone you’ve been with for decades. The dynamic largely dictates the kind of conversation you’ll have, so use your intuition about which approach fits.
This article is written with a penis-vagina hetero pairing in mind, because the penis really does matter in bad vag, but the gist applies to any relationship.
There are three reasons for your conversation
- A bad smell is off-putting and unpleasant for you as a lover.
- A bad smell usually means something is out of balance in her vagina that can be treated.
- If she has bad vag and you’ve been putting your penis into it, you may be carrying the same disruptive bacteria on your own penis, without symptoms, and passing it back and forth (or on to future partners).
Reasons 1 and 3 are about your experience, but the key to the whole thing is number 2. If she sorts out the underlying problem, the other two things go away. Treatment is the aim, and you can push for that while being nothing but kind about it.
Someone has to tell her – the argument for saying something
Imagine your penis smelt gross, but you couldn’t really tell, because you always wash in the shower, you never smell your hand after you touch it, you use a lot of scented products, or it’s just always been like that. Whatever the reason, you missed it.
You’d want a lover to say something, right? But instead your lover said nothing, just quietly stopped going down on you, or worse, kept going while secretly gagging. Washing the sheets the second you left. Scouring the internet for advice like this. Maybe quietly wondering if you’d cheated and caught a sexually transmitted infection (STI).
It’s never too late to gently tell someone they’ve got spinach in their teeth, a smelly foot or bad vag. Done kindly, it’s a good thing to do for someone you care about.
For more on the smells themselves, see our guide to vaginal smells and tastes.
Is something wrong with her vagina?
One reason blokes tend to hang back on ‘women’s business’ is that men are kept in the dark about vaginas, so they feel they can’t help. Learning a bit here is worth it, because you’re going to your girlfriend with a problem, and it helps to have the pathway forward in hand.
Happily, there are only a handful of causes of bad vag. She may have an STI such as gonorrhoea or trichomoniasis. More often it’s a form of vaginal dysbiosis – the protective bacteria being crowded out by disruptive ones – such as bacterial vaginosis (BV) or aerobic vaginitis (AV). Both can be linked to sex, but neither requires it. BV and AV can develop happily on their own.1,2
BV is the single most common vaginal complaint in the world, and the usual source of that classic fishy smell, which comes from amines released as disruptive bacteria take over and the vaginal pH climbs.1 It’s rarely talked about, even between women, because it’s embarrassing. It can also become stubborn and recurrent when it’s left alone or only ever hit with repeat antibiotics, which is exactly why early (or better-late-than-never) intervention matters.
Viruses and yeasts don’t usually cause bad smells, but they can still upset the ecosystem. Human papillomavirus (HPV), the virus women have cervical screening for, is a common co-traveller.
Bad vag can and does move between penises and vaginas, even with no symptoms on your end. Read more about bad vag and penises. Outside obvious things like showering regularly (which we’re taking as a given), bad smells are almost always bacterial.
What actually fixes bad vag
Masking the smell doesn’t fix anything, and nor does one more round of antibiotics if the same imbalance just grows straight back. The goal is to work out which bacteria are actually there, clear the disruptive ones, and rebuild the protective lactobacilli so the vagina holds its own again.
A healthy vagina is dominated by protective Lactobacillus species, especially Lactobacillus crispatus, which keep the pH low and disruptive bacteria out.3 Rebuilding that community is the whole game, and it’s exactly what our root-cause, microbiome-focused work targets directly – rather than only knocking bacteria down and waiting for them to grow back.
The first step is proper testing, so she’s not guessing. A comprehensive vaginal microbiome test shows exactly which bacteria are present and in what proportions, which sorts BV from AV from yeast from a healthy-but-hormonal picture. From there the options run the full range: conventional antibiotics where they’re warranted, plus microbiome rebuilding, targeted botanicals, biofilm-disruption and addressing the drivers (semen, the gut, hormones) so it doesn’t just bounce back.
In our clinic, recurrent BV and aerobic vaginitis are two of the most common reasons women come to us for the odour that won’t shift. Our free Killing BV guides walk through the whole approach, and if she wants a plan tailored to her results she can book an appointment.
The penis in bad vag
This is where you come in, literally. For years women were told BV was theirs alone to fix, and it kept coming back. We now have good trial evidence that this was missing half the picture: when the male partner is treated at the same time as the woman, BV recurrence is roughly halved compared with treating her alone.4
In plain terms, disruptive bacteria can live on and around the penis and reseed her vagina every time you have unprotected sex. So this isn’t just a women’s problem. Whatever she’s got, there’s a fair chance you’re carrying it too, symptoms or not, which is why treating you both at once gives the best shot at making it stick.
Understand this is going to be uncomfortable
Bringing up the smell of someone’s genitals to their face is hard. It’s embarrassing for you both. But it’s worth doing, even though it’d be easier to slink off into the night and let someone else deal with it.
Your girlfriend may have no idea there’s a problem, or how noticeable it is, or what it might mean for both of your sexual health. This isn’t just an awkward chat – both of your sexual health can be tied up in it, and it matters more than it feels like in the moment.
Rules to live by
Vaginas naturally smell ‘of the sea’, but not fishy and not unpleasant. A healthy vagina is generally pretty neutral, though a particular woman’s scent will usually shift a bit across her menstrual cycle. Mostly a healthy vagina smells the way skin does – like not much at all.
It’s not normal for a vagina to smell off, fishy, like rotten meat, ammonia, metallic, old blood or musty. Even when a change is cyclical, a bad smell still points to an underlying bacterial imbalance.
Worth remembering too: when we’re aroused we give off different odours, but these have a distinct ‘sex’ smell that’s not unpleasant, even if it’s strong. That’s not bad vag.
There’s also natural variation in how much we enjoy someone else’s body odour, down to our own biology. We do a lot of judging of lovers, food and the world through our nose. Sometimes you just don’t love the way someone smells, and that’s ok too – that’s about the two of you rather than a sign something’s wrong.
For the practical side, see dealing with unpleasant vaginal tastes and smells.
You need to be able to tell your personal preference apart from something actually being wrong. It’s usually obvious, but a slightly-off odour plus sex smells plus a sweaty day can be subtle. Bad vag won’t always make a pot plant wilt.
Your lover might not notice what you do – you’re getting a close-up she never gets. Plenty of women don’t know to check their own scent now and then to keep tabs on it.
Talking about it
You’ve got two broad options: end the relationship or stick with it.
If you’re ending things
If you’re leaving for whatever reason, still do her the courtesy of a kind heads-up, ideally said gently and directly rather than ghosting: something like, ‘this is a bit awkward, but you might want to get checked out, your vagina has smelt a little off and it’s usually an easy fix.’
If a face-to-face really isn’t possible and you’re worried an STI could be in the mix, an anonymous partner-notification service (such as this one) can nudge her to get tested. Only lean on it if a direct conversation really isn’t possible – a kind word from you is far better for her.
Sticking with it
If you’re staying, it’s worth raising, because a persistent smell that neither of you ever mentions will quietly wear on things – and, more to the point, it means something treatable is being left untreated. Sorting it is good for her health and your sex life both.
Choosing the right time to talk
The more low-key, kind and funny you can keep this, the better for everyone. If you’ve got the kind of relationship where you can just blurt it out, do – the faster the better. A good blurt sounds like:
‘I thought you should know that your amazing vagina normally smells beautiful, but it’s been a little off lately.’
Planning ahead
Timing helps. You don’t need to make it a ‘we need to talk’ talk, but if you’re unsure how it’ll land, think through a few things first.
Does she have time in the next few days to see someone and get tested? Is she about to fly out for work or a holiday? Are you planning a romantic getaway? Can she cover a consult or treatment right now? Is she mid-period?
Knowing what’s coming up for her means you don’t leave her stuck, unable to act on it quickly.
Using sex – and the smell while it’s fresh – as the catalyst
Sometimes the best moment is during or after sex, so you can honestly say that’s when you noticed it. We’re all vulnerable then, so be extra gentle if you go this way. Don’t pull a face, gag or make horrified noises – just ‘notice it seems different’ and bring it up softly.
This works even if she’s had bad vag the whole time you’ve known her. You get to decide whether to say that or just treat it as new – the result you’re after is the same, which is her getting it checked.
She might already know and explain it to you. Or she might not, and ask what you mean. Describe the smell plainly (words like ‘weird’, ‘unusual’, ‘different to normal’, and if it’s fishy, say so), but skip ‘disgusting’, ‘revolting’ or ‘repulsive’, even if that’s how it hit you.
You can say you’re no expert and that of course you love her vagina, but something might be going on with her bacteria.
Don’t accuse her of having a sexually transmitted infection, but don’t rule it out either. STIs can hang around long-term with no symptoms, and if you’re in the world of casual sex without condoms, they’re simply part of the picture.
Top tips for talking about bad vaginal tastes and smells
- Make sure she can get a proper appointment and has enough for the consult and any treatment.
- She needs proper testing to confirm what’s actually growing. If it’s BV, we’ve got plans for you both (Killing BV Vagina and Killing BV Penis).
- Once she has a diagnosis and a plan, read up so you actually understand what’s happened. Be an ally, not a bloke avoiding ‘women’s business’ – we’re past the 1950s. If a first treatment doesn’t hold, that tells you something useful about what’s really going on.
- Reassure her it doesn’t change how you feel. Depending on where she’s at, it can land hard – plenty of women absorb a cultural message that their body is the main thing they have to offer, so ‘defective’ or ‘disgusting’ can hit far deeper than you’d expect. Ask her, and talk.
- Ask her not to put anything in her vagina to ‘treat’ it before testing, or you’ll risk a false negative. Turning up with probiotics in there, or leftover antibiotics from a throat infection on board, can read as ‘all fine’ when it isn’t.
- Vaginas (and penises) are objectively hilarious and everyone knows it, but keep the jokes to yourself. Let her make them if she wants, laugh where it fits, then hug her and tell her how much you love her.
- Send her to My Vagina and Aunt Vadge – we’re bad vag experts.
What to do before the test results come back
- Once the swab’s been taken, she can use a six per cent hydrogen peroxide douche to clear out odours and fluids. It’s a short-term fix so you can have sex without nasty smells, not a cure – she’s still infectious because of the biofilm, so no bareback.
- If she’s feeling embarrassed, sex may be off the table anyway, but either way avoid penetrative sex without a condom and don’t ejaculate inside her. Semen is alkaline, which nudges the vaginal pH up and makes bacterial overgrowth worse fast. There are plenty of other fun places to leave your liquid gifts – find one.
- If you’ve been having unprotected sex, you may need treating too, so it’s in your interest to know what’s going on even with no symptoms of your own. Don’t write it off as her problem: whatever she’s got, you’ve likely got – and any other recent partners may too. Check in.
If you’ve got more questions, Ask Aunt Vadge – she knows everything.
This is general information, not a substitute for personalised medical advice.
- Coudray MS, Madhivanan P. Bacterial vaginosis – a brief synopsis of the literature. Eur J Obstet Gynecol Reprod Biol. 2020;245:143–148.
- Donders GG, Vereecken A, Bosmans E, Dekeersmaecker A, Salembier G, Spitz B. Definition of a type of abnormal vaginal flora that is distinct from bacterial vaginosis: aerobic vaginitis. BJOG. 2002;109(1):34–43.
- Ravel J, Gajer P, Abdo Z, et al. Vaginal microbiome of reproductive-age women. Proc Natl Acad Sci U S A. 2011;108(Suppl 1):4680–4687.
- Vodstrcil LA, Plummer EL, Fairley CK, et al. Male-partner treatment to prevent recurrence of bacterial vaginosis. N Engl J Med. 2025;392(10):947–957.
