Most condom failures are not the condom's fault. The gap between 98% protection and the 87% most people actually get comes down almost entirely to how a condom is used - not the product itself.
This guide covers how to put on a condom step by step, the ten most common mistakes and exactly why they matter, lube rules, sizing, and some additional guidance for internal condoms and oral sex. It goes further than a standard NHS guide because, as a specialist retailer, we think the detail matters.
How effective are condoms?
Used correctly and consistently, external condoms are more than 98% effective at preventing both pregnancy and the transmission of most STIs. That figure is based on perfect use - every time, from start to finish, using the right size, with lube where needed.
Typical use effectiveness drops to around 87% for contraception. That gap - roughly 11 percentage points - is almost entirely explained by human error rather than product failure. Condoms do not randomly fail. They fail because of the mistakes listed later in this guide.
The consistency part matters as much as the technique. Using a condom correctly nine times out of ten still leaves a 10% window, which is why "every time" is part of the effectiveness figure. If you want to understand which STIs condoms do and don't protect against in more detail, our guide to which STIs do condoms protect against covers that in full.
This content is for informational purposes only. For medical advice or diagnosis, consult a professional.
Before you open it
Good condom use starts before you get anywhere near the wrapper. A couple of quick checks take seconds and make a real difference.
Check the expiry date on the foil, not the box. The box date tells you when the pack was manufactured; it is the foil that matters because individual condoms can sit in a box past the box date. An expired condom has degraded latex - it is more brittle, more prone to tearing, and the lubricant may have broken down.
Look for a CE or UKCA mark. This confirms the condom meets safety standards. If a condom does not have one of these marks, do not use it. This matters for anything bought from unofficial sources or brought in from outside the UK/EU.
Think about where it has been stored. Condoms should be stored in a cool, dry, dark place - a bedside drawer is ideal. A wallet is not. Neither is a car glovebox, a coat pocket, or a bathroom cabinet above a steamy shower. Heat, friction, and humidity all degrade latex gradually, and a wallet-stored condom that has been sat on repeatedly for three months may look fine but perform significantly worse. If in doubt, use a fresh one.
How to put on a condom - step by step
This is the part most guides rush through. Each step has a reason behind it.
- Tear the wrapper at the notch using your fingers. Not your teeth, not your nails, not a pair of scissors. Any sharp edge risks nicking the condom before you even take it out. Most wrappers have a tear notch on both sides - use it.
- Squeeze the condom out gently and check which way it unrolls. The condom should look like a small rolled disc. The rim should unroll outward (like the brim of a hat), not inward. If you place it on the tip and it does not begin to unroll easily, it is the wrong way up. Flip it - but use a fresh one if there is any chance of pre-ejaculate on the outer surface.
- Squeeze the tip. Pinch the reservoir tip firmly between your thumb and forefinger to push out all the air. Leave approximately 1cm of space at the tip. This space collects ejaculate after orgasm. Without it, the pressure from trapped air plus friction during sex creates a weak point that can cause the condom to tear from the tip inward.
- Place it on the head of an erect penis while still pinching the tip. A condom applied to a semi-erect penis will not fit correctly, is more likely to slip during sex, and the fit changes as erection develops - which can compromise the seal at the base.
- Roll it all the way down to the base in one smooth motion. It should reach the base of the shaft. If it stops before the base, the condom may be too small - not just uncomfortable, but genuinely higher risk. If it looks baggy and bunches up, it may be too large.
- Apply lube to the outside of the condom. Even if the condom is pre-lubricated (most are), additional lube reduces friction and makes a real difference to reliability. Water-based or silicone-based lube only for latex condoms. More on this in the lube section below.
- During sex, if the condom slips, breaks, or comes off, stop. Do not continue. Deal with it, then either use a new condom or consider emergency contraception and STI testing depending on the situation.
- After ejaculation, hold the base of the condom against the base of the penis while withdrawing. Do this while still erect. Withdrawal after the erection has faded is a reliable way to leave the condom behind.
- Remove the condom carefully. Do not let it snap off or fling. Roll it off rather than pulling from the tip.
- Tie the open end and wrap in tissue. Put it in the bin. Not the toilet - condoms should never be flushed as they can block plumbing and contribute to waterway pollution.
You can browse all condoms on our site if you are looking for a specific type, size, or brand to work with this process.
During sex - what to watch for
The application process is only part of it. Paying attention during sex takes very little effort and significantly reduces risk.
Check it is still in place if you change position. Condoms can shift during athletic or extended sex, particularly if there is not enough lube. A quick check costs nothing.
If the condom breaks, you will usually feel it. The sensation changes noticeably - increased heat and friction are the main indicators. Some people do not notice, which is why withdrawal and inspection are worth doing.
If the condom slips inside the body, do not panic. Remove it manually, clean up, and if there is any concern about pregnancy or STI exposure, seek appropriate advice. Emergency contraception is available without prescription from pharmacies, and sexual health clinics offer free STI testing.
Keep lube to hand. Extended sessions mean more friction. Reapplying lube during sex is completely normal and reduces the risk of mid-session failure. Use a lubricant that is compatible with your condom - which means water-based or silicone if you are using latex.
After sex - how to remove it correctly
Most of the how-to guides cover application in detail and then rush the removal, which is where a lot of spills happen.
Withdraw while still erect. Once the penis softens, the condom sits loosely and is much more likely to slip off during withdrawal, depositing its contents. Holding the rim of the condom against the base of the penis as you withdraw keeps everything contained.
Remove the condom away from the body - not directly over a partner. Hold it at the base, roll it off in a controlled way, and tie a knot in the open end. This prevents spillage when binning it.
Wrap in tissue and put in the bin. The toilet is not a suitable disposal route - condoms are not biodegradable in the way toilet paper is, and they cause blockages.
Wash your hands after handling a used condom before touching anything else.
The 10 most common mistakes
These are the errors that explain the gap between 98% and 87%. Most of them are easy to fix once you know about them.
1. Wrong size. This is the single biggest contributor to condom failure that people underestimate. A condom that is too tight is more dangerous than one that is slightly loose - the tension concentrates at the tip and causes tears. A condom that is too loose slips. Neither is a great outcome. Our condom size guide explains how to measure correctly and which brands run large or small. If standard condoms feel restrictive, look at large condoms before assuming any brand will do.
2. Not leaving space at the tip. Rolling a condom all the way to the tip with no reservoir space creates an air bubble that has nowhere to go under pressure. The tip tears. Squeeze the tip before and during application - this takes about two seconds and matters enormously.
3. Oil-based lube with latex condoms. Coconut oil, baby oil, Vaseline, moisturiser, massage oil, butter - all of these will begin to degrade latex within 60 to 90 seconds of contact. The condom will not visibly fall apart; it will simply become weaker, and you will not know until it fails. Use water-based lubricants or silicone-based lube. Silicone lube lasts longer and does not dry out, but cannot be used with silicone toys.
4. Putting it on the wrong way round and flipping it. If you place the condom on the tip and it does not unroll, the natural instinct is to flip it and try again. The problem is that the outer surface of the condom (which is now the inner surface after flipping) has been in contact with the tip of the penis and may have pre-ejaculate on it. Pre-ejaculate can contain sperm and some STI-causing pathogens. Use a fresh condom.
5. Not checking the expiry date. Latex degrades over time. Most condoms have a shelf life of around 5 years, though this varies by brand and whether they are medicated (spermicidal condoms have a shorter shelf life). Always check the foil, not the box.
6. Storing in a wallet, car, or bathroom. Heat and friction are the main enemies of latex. A wallet condom that has been sat on repeatedly in a back pocket is not the same product it was when it left the factory. Keep condoms somewhere cool, dry, and out of direct sunlight.
7. Tearing the wrapper with teeth or nails. Tiny punctures from a tooth or nail are not always visible to the naked eye, but they are enough to compromise the condom. Use the tear notch. It is there for exactly this reason.
8. Not using additional lube. Pre-lubricated condoms carry enough lubrication to make application possible; they do not carry enough for extended use, for anal sex, or for anyone who tends toward dryness. Friction is the primary cause of mid-use tears. Using a compatible lubricant is not optional for anal sex - it is essential. The rectal tissue does not self-lubricate, and the risk of tearing without lube is substantial.
9. Not holding the base during withdrawal. As the penis softens after ejaculation, the condom fits more loosely. Withdrawing without holding the rim at the base means the condom stays inside while the penis exits. This is a straightforward source of condom failure that is entirely preventable with one small habit.
10. Using two condoms. The logic seems sound - double protection - but in practice two condoms rubbing against each other create more friction, not less risk. The outer condom is more likely to tear than a single condom used correctly with adequate lube. Use one condom, the right size, with lube. That is the optimal configuration.
Using lube correctly with a condom
Lube is not optional. It directly affects how a condom performs, and it makes the whole experience significantly better for both partners.
Water-based lube is the safe choice for all latex condoms. It is compatible with latex, easy to clean up, and works with all toys. The main drawback is that it can dry out during extended sessions - keep the bottle nearby and reapply as needed. Look at our range of water-based lubricants for options.
Silicone-based lube lasts longer, does not dry out, and is latex-compatible. It is the preferred choice for anal sex and longer sessions. It cannot be used with silicone toys, as it degrades the material over time.
Oil-based lube - coconut oil, Vaseline, anything with an oil base - degrades latex within minutes. If you are using a latex condom, do not use oil-based products anywhere in the vicinity.
Non-latex condoms (polyurethane or polyisoprene) are compatible with oil-based lubes, though water-based and silicone options are still the most practical choice. If you are using a non-latex condom specifically to use oil-based products, double-check compatibility on the packaging.
Apply lube to the outside of the condom after it is fully on. You can also apply a small amount inside the tip before putting the condom on - this increases sensation and reduces friction at the most vulnerable point.
For anal sex: use more lube than you think you need, and then use a bit more. This is not a situation where a small amount will suffice.
Internal condoms: a different process
Internal condoms (also called female condoms) work differently and are worth understanding as an alternative - particularly because the person being penetrated has control over their own protection.
An internal condom is a loose pouch made from nitrile (not latex, so compatible with all lubes including oil-based). It has a flexible inner ring that sits inside the vagina or anus, and an outer ring that sits outside the body.
The process is different from external condoms:
- The inner ring is squeezed and inserted deep into the vagina or anus, with the closed end covering the cervix or sitting at the top of the anal canal
- The outer ring stays outside the body and lies flat against the labia or the outside of the anus
- The pouch lines the walls of the vagina or anus rather than covering the penis
- Unlike external condoms, an internal condom can be inserted up to 8 hours before sex - which means preparation is possible well in advance
- During penetration, the penis should enter inside the pouch, not between the pouch and the vaginal or anal wall - check this if you are using one for the first time
- After sex, twist the outer ring to seal it, remove gently, wrap and bin (not the toilet)
Internal condoms are around 95% effective with perfect use. They are available in our internal condoms section.
One practical note: internal condoms are noisier than external condoms. Adding lube inside the pouch before sex reduces this.
Dental dams and oral sex
Condoms do not protect against STI transmission during oral sex because they do not cover the relevant surface area. Dental dams are the equivalent protection for oral-vaginal and oral-anal contact.
A dental dam is a flat sheet of latex or polyurethane that is held over the vulva or anus during oral sex. You can also cut an external condom lengthways to create a flat sheet if a dental dam is not available.
They are not commonly used, but they are relevant to anyone managing STI risk comprehensively - particularly for infections like herpes, HPV, and gonorrhoea that can be transmitted through oral sex.
FAQs
Can you use a condom with lubricant that is already on it?
Yes - most condoms come pre-lubricated. The pre-lubrication makes application easier and initial use more comfortable, but it is not sufficient for extended sex or anal sex. Add additional lube to the outside after putting the condom on.
What happens if a condom breaks?
If you notice a condom has broken during sex, stop and replace it with a new one. If you notice after ejaculation, consider emergency contraception (available without prescription from pharmacies and sexual health clinics) if pregnancy prevention is relevant, and get tested for STIs at a sexual health clinic. Most clinics offer free walk-in or same-day testing.
Can you use two condoms at once for extra protection?
No. Two condoms create additional friction between them and increase the likelihood of both tearing. One condom used correctly with adequate lubricant is significantly more effective than two condoms used together.
How do you know if a condom is the right size?
A correctly-sized condom should unroll smoothly to the base of the penis without bunching, and should not feel constrictive around the shaft. The tip should sit close to the head without pulling tight. If standard condoms consistently slip, feel too tight, or leave a gap, use our condom size guide to find a better fit.
Are thin condoms less safe than standard ones?
No - thin condoms like EXS Air Thin are tested to the same safety standards as standard condoms. They must pass the same burst pressure and elongation tests to receive CE or UKCA certification. The difference is sensation, not protection level.
How long do condoms last?
Most condoms have a shelf life of around 5 years from manufacture, though this varies. Condoms with spermicide typically have a shorter shelf life of around 3 years. The date is on the foil - check it before use rather than relying on memory of when you bought them.
Do I need to use a condom during anal sex?
Yes - potentially more so than for vaginal sex, because rectal tissue is more fragile and more susceptible to tearing, which increases the risk of STI transmission. Use plenty of lube (more than you think you need), consider a thicker or reinforced option like Pasante Extra Safe or browse our extra safe condoms, and do not skip the lube step.
Can a condom get stuck inside the body?
A condom that slips off during vaginal sex will sit in the vaginal canal and can be removed manually - it cannot travel further. It is not an emergency. If you cannot reach it easily, a healthcare professional can remove it. For anal sex the same principle applies, though if you cannot locate it comfortably, seek medical help rather than attempting to retrieve it yourself.
This content is for informational purposes only. For medical advice or diagnosis, consult a professional.
