Why Does Sperm Sometimes Smell Fishy?
By Dr. Raina N. Nahar +2 more
Medically reviewed by Dr. Raina N. Nahar
Last updated: Jul 16, 2025 Published on: Jan 4, 2024
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By Dr. Raina N. Nahar +2 more
Table of Contents
It is not uncommon for individuals to notice changes in their bodies from time to time. However, when such changes relate to intimate or sexual health, many people may feel uncomfortable discussing them1.
This article aims to provide clear, factual information about a concern some individuals experience, a noticeable odour, often described as “fishy”, following sexual intercourse. We will explore several potential reasons for this occurrence, including the role of diet, hygiene practices, and possible underlying infections2.
Please note: The information shared here is for educational purposes only and the reader should consult a registered medical practitioner before implementing any changes to their health routine.
Did you know?
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. Semen is a bodily fluid that contains sperm along with other substances, and its composition can vary based on factors such as hydration, diet, and overall health. While these changes are usually harmless, understanding them can help individuals feel more informed and at ease with their bodies6.
Sperm and semen are not the same. Sperm are tiny male sex cells whereas semen is the liquid that carries them out during sexual activity. Semen consists of several elements, including sperm cells, nutrients that support the sperm (such as sugars), enzymes, and other substances. While semen is essential for natural conception, changes in its smell, consistency, or colour may occur for various harmless reasons and are generally not a cause for concern unless accompanied by other symptoms1.
Semen consists of1:
When semen mixes with the natural bacteria in and around the vagina, it can sometimes produce a fishy smell. This is usually harmless, but if the odour is strong or lasts for a long time, it is best to seek medical advice.
Diet can influence the natural odour and taste of bodily fluids, including semen. What you eat may affect body chemistry and the balance of bacteria, which in turn can lead to noticeable changes1.
Anal sex can sometimes contribute to a noticeable odour during or after sexual activity. This is because the anus and vagina are located close together, and odours from the rectal area can mix with vaginal secretions. Additionally, if bacteria from the rectum are introduced into the vaginal area, they may disrupt the natural balance of bacteria, potentially causing odour or increasing the risk of infection. The warm and moist environment around the genitals can further encourage the growth of odour-producing bacteria5.
Good hygiene practices and safe sexual habits, such as using protection and avoiding the transfer of bacteria between areas, can help reduce these risks.
Sweat in the genital area, along with traces of stool near the vaginal region, can contribute to unpleasant odours during or after sexual activity. Inadequate cleaning may allow odour-causing bacteria to grow. Maintaining good personal hygiene is essential for keeping the intimate area healthy and reducing the likelihood of unwanted smells.
Vaginal discharge is is another factor that may affect odour after sexual activity. This natural fluid plays an important role in keeping the vagina clean and healthy. Its appearance, texture, and smell can provide useful insights into one’s sexual and reproductive health.
Normal discharge is typically clear or white and has a mild scent. However, noticeable changes in colour, consistency, or odour may indicate an imbalance or possible infection. In such cases, seeking medical advice is recommended.
Trichomonas which is a sexually transmitted infection can give a fishy smell to the vagina or penis10.
Dr. Siddharth Gupta, B.A.M.S, M.D (Ayu)
A fishy odour after sexual activity will usually disappear within a few hours or after washing. However, persistent or strong smells may indicate an underlying health issue. If you experience any of the following odours alongside other symptoms, it is important to consult a healthcare professional2,4:
Although some causes of a fishy smell after sexual activity can be difficult to completely prevent, there are several steps you can take to help reduce the risk:
Keeping the genital area clean is an important step in reducing unwanted odours following sexual activity7.
Consuming foods rich in probiotics or taking probiotic supplements may help support a healthy balance of bacteria in the body. This could potentially reduce the growth of odour-causing bacteria in the vaginal area. However, it is advisable to consult a healthcare professional before beginning any new supplement7.
Making small adjustments to your daily routine can significantly reduce the risk of unpleasant odour following sexual activity8,9:
It is important to recognise that a fishy smell following sexual activity is common and can have various causes. From the natural composition of sperm and semen to personal hygiene practices, maintaining a healthy balance between beneficial and harmful bacteria is essential to prevent unpleasant odours.
Recognising when to seek medical advice for persistent or worsening odours is vital for your overall health. By staying attentive to your body’s signals and maintaining healthy habits, you can help ensure comfort, confidence, and well-being throughout your life.
Also Read: Penile Cancer: Symptoms, Diagnosis & Treatment
Yes, semen can sometimes add to a fishy smell in the vagina, especially if it mixes with bacteria in a woman’s vagina.
Trichomoniasis, an STD, can cause a fishy odour. Along with the bad odour, frothy, green-yellow discharge and pain while urinating can occur.
Yes, semen can change the pH level in the vagina. This change can lead to bacterial vaginosis. It can cause a fish-like smell.
Condoms can sometimes cause an odour. This is because the latex material might react with bacteria in the vagina. If you think you might be allergic to latex condoms, try using alternatives such as polyurethane or rubber condoms.
A fishy smell after intercourse can result from a vaginal infection, such as bacterial vaginosis, which alters the natural balance of bacteria and causes an unpleasant odour when mixed with semen. It’s important to consult a healthcare provider for proper diagnosis and treatment.
No, it is not normal for sperm to smell fishy. A fishy odour can indicate an infection, such as bacterial vaginosis or a sexually transmitted infection. It is advisable to consult a healthcare provider for an accurate diagnosis and appropriate treatment.
Dead sperm itself does not typically have a fishy smell. However, a fishy odour can arise from bacterial activity in semen, which may indicate an infection or imbalance in the reproductive tract.
Yes, diet can influence the odour of bodily fluids, including semen. Foods like fish, onions, garlic, and certain spices can alter body odour, including the smell of semen.
Bacterial infections like bacterial vaginosis and STIs such as trichomoniasis or chlamydia can alter the odour of semen to be fishy. It’s crucial to get tested and treated promptly if you suspect an infection.
Disclaimer: The information provided here is for educational/awareness purposes only and is not intended to be a substitute for medical treatment by a healthcare professional and should not be relied upon to diagnose or treat any medical condition. The reader should consult a registered medical practitioner to determine the appropriateness of the information and before consuming any medication. PharmEasy does not provide any guarantee or warranty (express or implied) regarding the accuracy, adequacy, completeness, legality, reliability or usefulness of the information; and disclaims any liability arising thereof.
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