Using a condom correctly every time is the single biggest factor in whether it actually works. With perfect use, external condoms have a failure rate of about 2% to 3% per year. With typical use, that number jumps to 14% to 18%, and the gap is almost entirely explained by inconsistent or incorrect technique. Here’s how to close that gap.
How to Put On an External Condom
Open the package carefully by tearing along the edge. Don’t use your teeth or scissors, which can nick the condom without you noticing. Before anything else, check that the condom is rolling the right way: the rim should roll outward, away from the tip, like a hat sitting right-side up. If you accidentally place it inside out, throw it away and start with a new one, since pre-ejaculate may already be on the surface.
Place the condom on the tip of the erect penis. Pinch the tip with your fingers to leave about a half-inch of empty space. That reservoir collects semen and reduces the chance of a burst. While still pinching the tip, unroll the condom all the way down to the base with your other hand. If it won’t unroll easily, it may be inside out or the wrong size.
After ejaculation, hold the rim of the condom against the base of the penis and withdraw while still erect. This prevents the condom from slipping off. Gently pull it off, keeping semen contained, wrap it in a tissue, and toss it in the trash. Never flush condoms.
How to Use an Internal Condom
Internal condoms (sometimes called female condoms) are pouches with a flexible ring at each end. The thick, closed-end ring goes inside the vagina and holds the condom in place. The thinner outer ring stays outside the body, covering the vaginal opening.
To insert one, find a comfortable position: lying down, squatting, or standing with one foot raised all work. Squeeze the sides of the inner ring together between your thumb and forefinger, then slide it into the vaginal canal. Use a finger to push the inner ring as far up as it will go until it rests against the cervix. Make sure the pouch isn’t twisted. During sex, guide your partner’s penis into the opening of the condom rather than alongside it.
To remove, gently twist the outer ring to seal in any fluid, then pull the condom out. Use it once and throw it away. One important rule: never use an internal condom and an external condom at the same time. The friction between the two materials can cause tearing.
Choosing the Right Size
Fit matters more than most people realize. A condom that’s too tight is more likely to break, and one that’s too loose is more likely to slip off or let semen leak out from the base. Research on condom failure shows that inexperience is the strongest predictor of breakage, and poor fit is a major reason why. People who had used condoms fewer than five times without problems were roughly 6.5 times more likely to experience a break than those with more experience.
Condoms are sized by nominal width, which is the diameter of the opening when laid flat:
- Small: 49 to 52 mm
- Regular: 52 to 56 mm
- Large: 56 to 60 mm
- Extra-large: 60 to 64 mm
If a condom leaves a tight, red ring at the base or feels like it’s squeezing, go up a size. If it bunches up or slides around during use, go down. Trying a few different brands and sizes is normal and worth the effort.
Condom Materials and Latex Alternatives
Most condoms are made from latex, which offers the strongest and most studied protection against both pregnancy and STIs. But about 4% of people have a latex allergy, and two synthetic alternatives exist.
Polyisoprene condoms are the closest substitute. They stretch and feel similar to latex, are approved for pregnancy and STI prevention, and work with water-based and silicone-based lubricants. Polyurethane condoms are thinner and transfer heat better, which some people prefer, but research suggests they may be slightly less effective than latex for preventing pregnancy and possibly STIs. They do have one practical advantage: they’re compatible with oil-based lubricants.
Lambskin condoms are a different story entirely. They prevent pregnancy but are porous enough to let viruses through, so they are not approved for STI prevention. If avoiding STIs is part of your goal, stick with latex, polyisoprene, or polyurethane.
Lubricant Compatibility
Using the wrong lubricant with the wrong condom material can cause a failure in seconds. Oil-based products, including coconut oil, petroleum jelly, body lotion, and massage oil, degrade latex condoms in as little as 60 seconds of contact. That degradation weakens the material enough to cause breakage during use.
For latex and polyisoprene condoms, use only water-based or silicone-based lubricants. Polyurethane condoms are compatible with all lubricant types, including oil-based. If you’re unsure, water-based lubricant is the safest default for any condom material. Applying a small amount to the outside of the condom (and a drop inside the tip, if you like) reduces friction and makes breakage less likely.
Storage and Expiration
Condoms are more fragile than they look when it comes to storage. Heat above 104°F (40°C) weakens latex, and that temperature is easily reached inside a car glove box in summer, a wallet pressed against your body, or a bathroom cabinet near hot pipes. Humidity also accelerates degradation.
Store condoms in a cool, dry place at room temperature. A nightstand drawer or a dedicated pouch in a bag works well. Keeping one in your wallet for months is a common habit, but the combination of body heat, pressure, and friction wears down the material over time. A wallet is fine for a night out, not for long-term storage.
Always check the expiration date on the wrapper before use. If the package looks damaged, dried out, or brittle, discard it and use a fresh one.
Why Two Condoms Are Worse Than One
Doubling up seems logical but actually increases risk. Two condoms, whether two external condoms or one external and one internal, create friction between the layers. That friction generates heat and mechanical stress that can cause one or both condoms to tear. One condom, used correctly, is always more effective than two.
What to Do If a Condom Breaks
If a condom breaks or slips off during sex, you still have options. For pregnancy prevention, over-the-counter emergency contraception is most effective within 72 hours but can be taken up to five days after. A prescription alternative also works within that five-day window and is equally time-sensitive.
For STI concerns, bacterial infections like chlamydia and gonorrhea can be detected on a test right away. Viral STIs like HIV and herpes take longer to show up because your body needs time to produce detectable antibodies; your provider will tell you when to come back for accurate testing. If you believe you were exposed to HIV specifically, preventive treatment called PEP must be started within 72 hours of exposure to be effective.
Breakage and slippage tend to repeat. Research from the Guttmacher Institute found that people who had experienced one condom break were 3.6 times more likely to have another, and after two or more breaks the odds jumped to 9.3 times higher. If condoms keep failing, the cause is usually a fixable issue: wrong size, insufficient lubrication, incorrect application, or expired product. Addressing those factors makes a significant difference.