A fishy smell after sex, often from semen mixing with vaginal fluids, usually points to Bacterial Vaginosis (BV) or an STI like Trichomoniasis, both common infections that disrupt vaginal pH and need medical treatment, though sometimes it's just the natural pH shift or even diet/hygiene affecting the natural scents. If you notice itching, unusual discharge (green, grey, white), or pain, see a doctor for diagnosis and antibiotics; otherwise, good hygiene, cotton underwear, and avoiding douching helps.
The smell after sexual activity at times is may simply be a combination of each partner's natural body odour. This can also include the presence of sweat or residues from personal care products, which may alter the overall smell. In some cases, semen may contribute to this change.
A fishy smell in semen often indicates the presence of bacteria, possibly from an infection. This could be due to various conditions, including bacterial vaginosis, STIs, or prostate infections. Good hygiene and medical evaluation are important if this smell persists.
Bacterial vaginosis (BV)—This is not a true infection, but a condition that happens when there is too much unhealthy bacteria and not enough healthy bacteria present in the vagina. BV comes with clear, heavy discharge that often has a fishy smell.
The main symptoms of trichomoniasis are a yellow-green discharge from your vagina that may smell like fish, and pain when peeing. Symptoms can start 5 to 28 days after being infected, but sometimes you may not get them until much later.
With BV, you will see an increase in discharge as well as a strong fishy odor that gets strong after sex. After proper diagnosis, you can be treated easily with prescription oral pills and vaginal gel. Many STDs such as Trichomoniasis, (“Trich”) Gonorrhea, Clamydia, HPV, Syphylis and even HIV can cause a vaginal smell.
Yes, bacterial vaginosis (BV) can sometimes go away on its own, as it's considered "self-limiting," but it's not recommended to wait, especially if you have symptoms, due to risks like increased susceptibility to STIs (HIV, chlamydia, gonorrhea), Pelvic Inflammatory Disease (PID), and pregnancy complications (preterm birth, miscarriage). Medical treatment with antibiotics is usually suggested for symptomatic cases to prevent these serious health issues, particularly during pregnancy, say experts from the CDC and Cleveland Clinic.
Bacterial vaginosis (BV) is a common vaginal infection that happens when some normal bacteria that live in your vagina overgrow, causing a bacterial imbalance. Symptoms include an off-white or gray vaginal discharge that smells “fishy.” BV is easily treatable with antibiotics from a healthcare provider.
Bacterial vaginosis is usually treated with antibiotic tablets or gels or creams. These are prescribed by a GP or sexual health clinic. If you have a same-sex partner, they may also need treatment.
Trimethylamine has been described as smelling like rotten or decaying fish. As this compound builds up in the body, it causes affected people to give off a strong fishy odor in their sweat, urine, and breath. The intensity of the odor may vary over time.
Signs of Unhealthy Sperm
Changes in diet can affect the smell of semen. To improve the smell, men should avoid foods with strong odors, such as fish. They should also avoid foods that change the smell or color of other bodily fluids, such as asparagus.
Semen is alkaline and often women find they notice a fishy smell after having sex. This is because the vagina wants to be slightly acidic, but if it's knocked out of balance by the alkaline semen, and it can trigger BV.
With BV, you may not have symptoms. You could have a thin white or gray vaginal discharge. There may be an odor, such as a strong fish-like odor, especially after sex. Yeast infections produce a thick, white discharge from the vagina that can look like cottage cheese.
Bacterial vaginosis (BV) can make discharge after sex more noticeable. It occurs when the pH of the vagina changes, disrupting the healthy balance of bacteria in the vagina. Having a new sexual partner, multiple partners, or regularly douching can each increase the risk of developing BV.
Healthy tips to reduce vaginal odor
BV is a common infection, especially among pregnant women. The cause of BV is not fully understood; it is not caused by poor hygiene. The women affected by BV may not show any signs or symptoms. Frequent washing (especially with deodorant soap) may result in disrupting the vaginal balance.
You can add two cups of apple cider vinegar to a warm bath and soak for about 20 minutes. The vinegar can help neutralize odors and restore the natural pH balance of your vagina.
Some drinks that may improve vaginal health include cranberry juice, kefir, drinkable yogurt, coconut water, green tea, orange juice, and mango smoothies. If you have any new or uncomfortable vaginal symptoms, let your healthcare provider know so they can recommend treatment.
The most common causes of unpleasant vaginal odor are: Bacterial vaginosis (BV): An infection that's caused by an imbalance in your vagina's flora. BV is responsible for the fishy smell most commonly associated with unpleasant vaginal odors. The fishy smell may be especially strong after sex.
Yes, bacterial vaginosis (BV) can sometimes go away on its own, as it's considered "self-limiting," but it's not recommended to wait, especially if you have symptoms, due to risks like increased susceptibility to STIs (HIV, chlamydia, gonorrhea), Pelvic Inflammatory Disease (PID), and pregnancy complications (preterm birth, miscarriage). Medical treatment with antibiotics is usually suggested for symptomatic cases to prevent these serious health issues, particularly during pregnancy, say experts from the CDC and Cleveland Clinic.
How do I know if I have BV?
There are also at-home vaginal pH test kits. These kits use a swab or paper strip that changes color after you moisten it with vaginal fluid. A chart shows you what the color means. A high pH (high acidity) is a sign that you may have BV, but it doesn't mean you have BV for sure.
While stress in itself cannot 'cause' BV, studies show that prolonged mental stress of any form, be it anxiety leading to BV, depression, and vaginosis, or stress-related BV, can indeed affect the body's immune response, making a woman more susceptible to infections.
BV is a relatively mild condition, but, left untreated, it can cause serious reproductive health problems. Untreated BV can increase the chances of contracting a sexually transmitted disease, cause pelvic infection or inflammation, and lead to pregnancy complications, such miscarriage or premature labor.