Christmas Sale Now On!
🎁View our festive offers here 🎁

🎁 Christmas Sale Now On! View our festive offers here 🎁

BLACK FRIDAY – Up to 50% Off Tests, Refills & Supplements

STIs and male fertility – is there a link? 

STIs And Male Fertility – Is There A Link

We use Advanced AI to translate our blog content. If the translation isn’t perfect, or if you have any queries about the content, our medical team is readily available to answer. Simply email [email protected]

There is a lot of conversation about sexual health and female fertility – but what about STIs and male fertility? Here we’ll discuss some of the most common sexually transmitted infections and how they can impact your sperm health and future fertility. 

Can STIs impact male fertility?

Put simply – yes they can, especially if you leave them untreated. There’s a belief that STIs are more likely to cause infertility in women – and that’s kind of true – but not for the reason, you may think. STIs in men are more likely to show symptoms that are hard to ignore, which means they generally get treated faster before they can do much damage. For women, many STIs are pretty much symptomless, which means without regular sexual health check-ups, they can go undiagnosed and untreated for years. 

The truth is that STIs can cause mayhem for your fertility whether you get symptoms or not, so the best course of action is to use protection and get regular check-ups. Now let’s dive into the most common STIs – protection at the ready! 


Chlamydia is probably the most common STI of them all – affecting millions of people a year. For women, an untreated case of chlamydia can lead to pelvic inflammatory disease which can have a real impact on fertility – but men aren’t off the hook either! 

Studies have indicated that men with chlamydia are at higher risk of DNA Fragmentation. Fragmentation in chlamydia-positive or mycoplasma-positive men was 3.2 times higher than in those who hadn’t come into contact with the virus. 

Now, this doesn’t mean that if you have or have had chlamydia, that your fertility is guaranteed to be impacted – it’s all about catching it early. Men are more likely than women to exhibit symptoms of the infection and they will usually develop around 1-3 weeks after contact with the infection. Keep an eye out for pain when peeing, pain in your testicles or white, cloudy or watery discharge from the tip of your penis. However, only half of men will show symptoms – so staying on top of your sexual health MOT is key! 


Herpes is one STI that’s very common and very hard to shift – and yet there is still a big research gap around the impact that this particular STI can have on male fertility. A small scale study found that men with HSV-1 (oral herpes) and HSV-2 (genital herpes) seemed to display a lowered sperm count, but more research definitely needs to be done. 

Unlike conditions like chlamydia – which can be cleared up with a short course of antibiotics – once you contract herpes it stays in your system. However, there are medications that can help to manage the virus –  reducing breakouts and the risk of transmission. This is important because whilst we are still unsure about the link between herpes and male infertility – we do know that it can be extremely harmful to newborn babies. If a woman is infected with herpes during pregnancy, it can pass on to the baby during labour – and in some cases can be fatal. 

If you have the herpes virus and are trying for a baby, you want to be very careful not to pass it on to your female partner. Speak to your GP about the best way to reduce transmission and risk. 


Gonorrhoea can be a really sneaky STI to catch – as symptoms often don’t turn up until a month later! If and when they do show themselves, they can be pretty nasty – keep an eye out for yellow or green discharge from your penis, burning sensation when you pee and a swollen foreskin (ouch…)

When it comes to sperm health, there aren’t masses of research to imply that this STI has a massive impact on male fertility. However, it can cause certain conditions that are linked to infertility – namely urethritis. Urethritis is basically inflammation of the urethra, the tube semen from the testicles and urine from the bladder (the likely culprit of that burning pain when you go to the toilet!) This can also trigger epididymo-orchitis, inflammation of the epididymis (a duct behind the testicles) and/or your testicles themselves. 

With all this potential inflammation going on in your babymaking zone, it’s unsurprising that there could be knock-on effect on your fertility, Whilst a lot more research needs to be done, a small study does indicate a link between gonorrhoea induced urethritis and epididymo-orchitis poor sperm health. In the study, previously fertile men were tested 2 years after having the infection and associated inflammation. Only 40% of the participants had sperm that would be classed as healthy. 


Years ago, a HIV diagnosis meant that you would struggle to survive – let alone become a father, but luckily nowadays that is far from the truth. With medical advancements, it is now possible to live a happy, healthy life with HIV – and that can also mean starting a family. 

A concern for some people with HIV is it being transmitted during unprotected sex. Whilst with medications like PrEP, the risk of transmissions is lowered to practically zero, if you have a female partner you may be worried about passing on the infection whilst trying to conceive. 

If this is the case, assisted fertility treatments can help you on your road to parenthood! Semen washing can remove sperm from the seminal fluid (the HIV virus is in the fluid, rather than the sperm cells themselves) and then use the sperm in IVF or IUI. One research project showed that across over 10,000 washed semen IVF cycles involving a male partner with HIV, there were absolutely no transmissions of the virus! 

In terms of male fertility and HIV – there are some things to be aware of. Firstly, whilst most medical research indicates that HIV itself does not cause infertility, there is evidence to suggest that the treatment of HIV could. Researchers have found that men with medication-managed HIV have reduced counts, motility and volume. Obviously, your health is paramount, so definitely don’t refuse treatment to prioritise your sperm health! However, it may be worth keeping a check on how your swimmers are doing – or maybe even freezing sperm before starting treatment. 

How to protect yourselves from STIs

As with all things family planning – forward thinking and being proactive is key – which is why it’s important to look after your sexual health ahead of becoming a father – and that means using protection. Now, it might seem counterproductive for a fertility business to tell you to use condoms, but as the above research shows, there is a definite link between STIs and male fertility. If you’re not actively trying for children right now, condoms are the best way to protect you from sexually transmitted infections, as well as pregnancy. 

The other key thing is to get tested regularly – especially if you have multiple sexual partners. It can be daunting to get checked out, but if you have anything it means you can get treated right away – which is also important. The vast majority of STIs won’t impact male fertility if you catch and treat them early and will often be cleared up with a course of antibiotics. 


The vast majority of STIs won’t impact male fertility if you catch and treat them early and will often be cleared up with a course of antibiotics. Call your doctor as soon as you have a suspicion that you have been contaminated or if you have any symptoms of infection. It’s better to call one time too many than to regret it later!”

Dr Fatin Willendrup, Head of Medical Affairs at ExSeed Health


How to stay on top of your fertility 

If you’re reading this and are concerned that a previous STI could have impacted your fertility – don’t stress. Just like it’s easy to check up on your sexual health, you can also check out your sperm health swiftly and simply. Our at-home sperm tests mean you can get to know your swimmers and check if your motility and count are normal – all from the comfort of your own home. 


ExSeed home sperm test kit 2 test
ExSeed Home Sperm Test Kit (2 tests)


Refill Kit Monthly Subscription

£24.99 / month

Christmas Combi
ExSeed Combi


More to explore

ExSeed home sperm test kit 2 test
ExSeed Home Sperm Test Kit (2 tests)


Christmas Combi
ExSeed Combi


Christmas 5 test refill
ExSeed Refill Kit (5 tests)


Wearing tight pants and underwear

Studies show that men who wear looser underwear have higher sperm concentration and total sperm count compared to men who wear tighter underwear. So, lose the tight clothes and wear something loose to give your testicles some air.

CONCLUSION: learn more about how heat can affect sperm quality here.


Besides higher mortality rate and various diseases, stress is associated with low sperm quality. Stress is known to be associated with lower testosterone levels and oxidative stress with both playing an essential role in producing and maintaining healthy sperm cells.

CONCLUSION: If you feel stressed, we recommend you get some help so you can have a balanced mental health. For a stress management guide, download the ExSeed app for free and start your personalized action plan today.

Physical activity

Scientific studies show that men who are physically active have better semen parameters than men who are inactive. Fertility specialists also state that regular physical activity has beneficial impact on sperm fertility parameters and such a lifestyle can enhance the fertility status of men.

Prioritizing exercise can help improve your overall health and result in healthy, fast swimming sperm cells that have good chances of fertilizing an egg.

CONCLUSION: Try incorporating exercise in your weekly schedule to you ensure exercising at least twice weekly. We recommend a combination of cardio training and strength exercise. Read more about exercise and male fertility on our blog.


Fast Food
Processed foods damage the health of sperm-producing cells and cause oxidative stress, which lead to poorer sperm quality. Heavy consumption of junk food (every week) can increase the likelihood of infertility since men who consume vast amounts of unhealthy food are at risk of having poor sperm quality. Besides harming your fertility, junk food enlarges your waistline, harms your cardiovascular system, kidneys, and more.

Eating more fruit and vegetables can increase your sperm concentration and motility. It’s important that you consume a healthy diet filled with antioxidants and that you eat vegetables every day. Foods such as apricots and red bell peppers are high in vitamin A, which improves male fertility by nurturing healthier sperm. Men who are deficient in this vitamin tend to have slow and sluggish sperm.

Sugary snacks/beverages: several times a week Excessive consumption of high sugar items can lead to oxidative stress, which negatively impacts testosterone levels and sperm motility. Sugary snacks and beverages are also highly associated with obesity and low fertility.
CONCLUSION: To boost sperm quality, stay away from fast food, processed food, and sugary snacks or beverages. You need to implement a healthy prudent diet filled with necessary superfoods needed for good sperm production. Check out our guide to Male Fertility Superfoods. For personalized guidance and support on how you can start improving your sperm health, check out the Bootcamp.


Direct heat can inhibit optimal sperm production and cause Sperm DNA damage. Sperm cells like environments that are a couple of degrees lower than body temperature. Avoid overheating from warm blankets, seat warmers, heat from your laptop, hot showers, and saunas.

Cigarette smoking

The exposure to tobacco smoke has significant negative effects on semen quality. The damage of cigarettes and nicotine of course depends on how many cigarettes you smoke per day and for how long, but even low usage (up to 10 cigarettes / day) can inhibit healthy sperm production.  

CONCLUSION: Stay as far away from cigarette smoking as possible if you care about your general health and your fertility. Read more here.

Cell phone

When you have your cell phone in your front pocket, your testicles are exposed to electromagnetic radiation, which studies have shown to damage the sperm cells. Put your phone in the back pocket of your pants or in your jacket pocket.


There is a clear association between obesity and reduced sperm quality. At least part of the reason for this is that obese men may have abnormal reproductive hormonal profiles, which can impair sperm production and lead to infertility. 

A BMI higher than 30 can lead to several processes in the body (overheating, increase in oxidative stress in the testes, sperm DNA damage, erectile dysfunction) that can have a negative impact on male fertility. This can result in problems when trying to conceive.  

CONCLUSION: BMI is one of the risk factors that influence semen quality and, for example, sperm motility.  


A beer or glass of wine now and then do not really harm sperm quality. But excess alcohol drinking (more than 20 units per week) can reduce the production of normally formed sperm needed for a successful pregnancy.

CONCLUSION: If you want to stay safe, stay under 14 units of alcohol per week. For more information on how alcohol can affect male fertility, take a look at our blog: “Alcohol and Sperm Quality”.


Studies show that women younger than 35 and men younger than 40 have a better chance of getting pregnant. Men can produce sperm cells almost through their entire life, but the sperm cell DNA is more fragile and prone to damage after the age of 40.

As men age, their testes tend to get smaller and softer resulting in a decline in sperm quality and production. These changes are partly because of an age-related decrease in testosterone level, which plays a very important role in sperm

production. Higher male age (>40 years) is not only associated with a decline in sperm production but also with increased sperm DNA fragmentation and worsened morphology (shape) and motility (movement). These negative effects make the sperm cells less qualified for egg fertilization.

CONCLUSION: with an age under 40, you shouldn’t have to worry much about age as a factor in itself. However, studies have shown a slow decline after the age of 30-35 years

and if you are above 40 years of age, your sperm quality can be affected due to increased sperm DNA damage resulting in a decrease of sperm motility and concentration. Remember that you cannot evaluate the quality of a sperm sample by just looking at it – this requires a sperm analysis.