CATIE statement on the use of condoms to prevent the sexual transmission of HIV

Over the past several years the HIV prevention toolbox has expanded significantly. This is due to a rapid growth in our knowledge of effective approaches that help prevent the transmission of HIV. However, to maximize the impact on the HIV epidemic, we must effectively increase awareness, uptake and proper use of these approaches.

The CATIE statements summarize the best available evidence on the effectiveness of three approaches to help prevent the sexual transmission of HIV. These statements were developed to help service providers in Canada adapt their programs and incorporate this evidence into their messaging.

There are three highly effective strategies to reduce the risk of the sexual transmission of HIV:

Highly effective strategies can reduce the risk of HIV transmission by 90% or more.

The following statement focuses on condoms. A simple key message is followed by recommendations for service providers and a list of available tools and resources. A review of the evidence is also provided that service providers can use for more specific discussions around risk according to clients’ needs. Please consult the companion statements for more information on the other two highly effective strategies.

Key Message

The consistent and correct use of internal (sometimes referred to as female) or external (sometimes referred to as male) condoms are highly effective strategies to reduce the risk of the sexual transmission of HIV. When a highly effective strategy is used consistently and correctly as part of a comprehensive plan for sexual health, it is rare for HIV to be transmitted.

For more information, please see the evidence review at the end of this statement.

Recommendations for service providers

Condoms are an essential component of HIV prevention efforts and continue to have an important role to play in reducing the rate of HIV transmissions in Canada.

Below are recommendations on how you might improve the uptake and use of condoms among your clients.

1. Improve awareness of condoms as a highly effective HIV prevention strategy, including the factors important for maximizing their effectiveness. Any educational and counselling activities provided for HIV-negative and HIV-positive clients should include information on the HIV prevention benefits of condoms and on how to use them correctly.

Education and counselling activities should also include discussion of other prevention strategies such as, but not limited to, pre-exposure prophylaxis (PrEP) and the use of antiretroviral treatment (ART) as prevention. Encourage clients to choose the combination of strategies that will work most effectively for them.

Internal condoms can be promoted to your clients as an effective alternative to external condoms for both vaginal and anal sex.

It’s important to remind clients of the correct use of condoms so they can prevent breakage, slippage and leakage during sex, and maximize condom effectiveness. The correct use of condoms means:

  • finding an external condom with the right fit and feel
  • storing condoms at room temperature and regularly replacing condoms that are kept in a wallet, purse or pocket
  • checking the expiry date and making sure the packaging isn’t damaged
  • using a new condom for every act of vaginal or anal sex and considering using a condom for oral sex
  • changing condoms if having sex with more than one partner or sharing sex toys
  • putting the condom on and taking it off correctly
  • applying sufficient and appropriate lubrication – only water- or silicone-based lubricants should be used with latex condoms; saliva should not be used as lubrication
  • using a condom for the entire act of sex (no delayed application or early removal)

The correct way to put on and take off an external condom is to:

  • carefully open the packaging so the condom does not tear
  • ensure the condom is put on the right way round
  • squeeze the tip of the condom when it is rolled over the penis (to remove air and leave space for semen to collect) and ensure it is unrolled to the base of the penis
  • immediately after sex, hold on to the condom while pulling the penis out of the vagina or anus
  • carefully pull the condom from the penis only when there is no contact with the partner’s body and take care that no semen spills out
  • safely dispose of the condom

The correct way to put on and remove an internal condom is to:

  • carefully open the packaging so the condom does not tear
  • put lubricant on the outside of the closed end
  • squeeze together the sides of the inner ring at the closed end of the condom and insert into the vagina or anus
  • push the inner ring into the vagina or anus as far as it will go, with the outer ring lying outside the vagina or anus
  • if the outer ring is pushed inside the vagina or anus, stop and put it back in the right place
  • make sure the penis enters the condom and does not go between the condom and the wall of the vagina or rectum
  • immediately after sex, slightly twist and pull the end of the condom to remove it, taking care not to spill any semen in the vagina or rectum
  • safely dispose of the condom

Unlike most HIV prevention strategies, condoms can also reduce the risk of other sexually transmitted infections (STIs) such as gonorrhea, chlamydia, herpes and syphilis, as well as unintended pregnancy. It is important to encourage condom use when there is an STI present or when there is a risk for STI transmission.

The protection against STIs is important for HIV prevention because some STIs can increase the risk of HIV infection and transmission.

2. Facilitate and support uptake and use of condoms as a prevention strategy. Condoms and lubricant should be made available (free, if possible) and offered to your clients during interactions with them. Encourage clients to find a condom that has the right fit and feel for them and a lubricant that is compatible with the condom they have chosen. Explore barriers to the consistent and correct use of condoms and support clients to overcome them. Common barriers to consistent condom use may include difficulty negotiating their use, lack of availability at the time of sex, erectile dysfunction, reduced pleasure or intimacy, poor comfort, and latex allergies. Possible solutions to these barriers include planning ahead to ensure condoms are available, using lubricant, and finding a brand of external condom that works best for the person. The solution to latex allergies may be to use non-latex external condoms, or opt for an internal condom instead of an external condom. You may also want to encourage clients to seek medical advice for erectile dysfunction, especially if condoms interfere with their ability to get or maintain an erection during sex. Exploring barriers to condom use with clients (such as the relationship between condoms and intimacy or difficulties with condom negotiation) can facilitate a discussion about highly effective HIV prevention strategies other than condoms, such as the use of PrEP, for example.

3. Encourage a comprehensive plan for sexual health. Discuss how condoms fit into a comprehensive plan for sexual health. When used consistently and correctly, condoms are a highly effective strategy to reduce the risk of the sexual transmission of HIV. However, they do not eliminate the risk. We know that for some people the consistent use of condoms is challenging. We also know that even when used consistently and correctly condoms can break, slip or leak, which decreases their effectiveness. We also know that while the risk for HIV transmission is quite low from a single exposure, the risk for HIV transmission increases over multiple exposures to HIV. This means that the more someone participates in a behaviour that poses a risk for HIV transmission the greater their risk of getting HIV. It’s important that clients know these risks so they can make an informed decision about combining condoms with other risk-reduction strategies to help minimize their HIV and STI risk over the long term.

If a condom isn’t used or breaks, then post-exposure prophylaxis (PEP) is a possible option for your clients to reduce the risk from that exposure. For clients who rely on non-condom HIV prevention strategies (such as PrEP or the use of ART as prevention), encourage condom use during periods of heightened HIV transmission risk, such as when PrEP medications are missed. Using condoms as part of a combination HIV prevention strategy can also reduce the risk for other STIs.

4. Address underlying risk of HIV transmission. HIV prevention counselling offers an opportunity to engage individuals at risk for acquiring or transmitting HIV in additional services. You can help your clients address the underlying factors that may increase their risk for acquiring and transmitting HIV, such as depression or alcohol and other substance use; reinforce safer sex strategies; and facilitate the increased use of all appropriate prevention strategies. You may find that risk-reduction counselling alone is not enough. You may need to provide – or link clients to – appropriate and relevant support services.

5. Offer comprehensive couples-based counselling. For couples, you may want to offer to counsel both partners in the relationship at the same time (couples-based counselling) as this may be more effective than counselling partners individually. Couples-based counselling can create a supportive space where clients can come to a consensual agreement on how to reduce their risk of HIV transmission, develop ways to support each other in using HIV prevention strategies consistently and correctly, and discuss potentially sensitive issues relevant to HIV prevention and condom use. Be prepared to discuss issues such as what a couple wants from sex and the type of sex they enjoy most; the desire for pleasure, intimacy, conception, and monogamy or non-monogamy; and disclosure of sex outside the relationship. This counselling can also support non-monogamous clients to develop strategies or agreements to reduce the risk of acquiring HIV or STIs from outside partners, such as the consistent and correct use of condoms when having sex outside the relationship.

6. Incorporate information about condoms into all prevention programming to increase its impact. In-person counselling is one way to convey information about condoms as a highly effective prevention strategy. However, this information can be integrated into a variety of other communication channels such as print publications, websites and campaigns to increase its reach and impact.

Tools and Resources

CATIE resources

Condoms for the prevention of HIV and STI transmission – Fact sheet

Condoms: Tried, tested and true? Prevention in Focus

Condoms, PrEP, and the use of antiretroviral treatment to prevent HIV – webinar

Couples HIV testing and counsellingPrevention in Focus

Other resources

Condoms Unwrapped – AIDS Committee of Toronto (ACT)


The latex condom has been well studied in laboratory tests and it has been determined that latex is impermeable to HIV: that HIV cannot pass through latex condoms.1–4 The polyurethane condom has also been found to be impermeable to HIV in laboratory testing.5 Although evidence is lacking in the literature for the other substances used to make condoms (nitrile and polyisoprene), evidence from safety and effectiveness data used for licensing condoms shows equivalent protection.6–8 Condoms made of lambskin are not impermeable to HIV and should not be used as an HIV prevention strategy.4

Condoms are impermeable to HIV, but can fail to prevent exposure to HIV if they break, slip or leak during use. A break, slip or leak during condom use is known as condom failure and can happen even when used correctly. These factors can reduce the ability of condoms to prevent HIV transmission.

Breakage refers to a condom tearing during sex. In studies enrolling mostly heterosexual couples, breakage rates for external condoms ranged between 0.4% and 3.4%.9–12 The breakage rate for internal condoms in one study was 0.1%.12

Slippage occurs when an external condom does not remain on the penis during sex or when an internal condom does not remain in the vagina or rectum during sex. Slippage rates for external condoms range from 0.63% to 1.1%.9–12 The slippage rate for internal condoms in one study was 5.6%.12

Leakage occurs when seminal fluid seeps out of the condom during or after sex. Leakage rates for external condoms range from 0.4% to 6.5%.13

Correct use of condoms means they are used with sufficient (and appropriate) lubricant, as this can decrease friction that can cause condom failure.14,15 Water- and silicone-based lubricants are safe to use with all condoms, but oil-based lubricants can compromise the integrity of latex and polyisoprene condoms and increase the risk of condom breakage.

In studies of condom breakage, slippage and leakage, it was not possible to know how many participants were actually using condoms correctly. However, research suggests that rates of condom failure decrease with more frequent condom use11,12,16 and the number of previous failure experiences.12 This evidence all points to the conclusion that over time people learn to use condoms correctly and this reduces failure rates. However, failure is never reduced to zero, even for experienced condom users who use condoms consistently and correctly.

Condoms have not been evaluated in randomized-controlled trials, which are generally considered to produce the highest quality evidence. However, observational studies of external condoms have been conducted among serodiscordant couples (in which one partner is HIV positive and the other is HIV negative). Subsequent analyses (meta-analyses) of these studies attempted to combine their results to calculate a single estimate of condom effectiveness. The earliest of these analyses estimated the effectiveness of consistent condom use to be somewhere between 69% and 94%.17–19 In the most recent analysis, the rate of HIV transmission was 80% lower among heterosexual couples who reported always using external condoms compared to those who never used condoms.20 A similar result (70% effectiveness) has been observed in observational studies of gay men and other men who have sex with men.21 No studies have evaluated the effectiveness of internal condoms in preventing HIV transmission during vaginal or anal sex.

However, these observational studies and meta-analyses don’t tell us how effective condoms are when used consistently and correctly. There are three key factors that limit our ability to know how effective condoms are when used consistently and correctly:

  • The available studies did not measure whether condoms were used correctly. We know that incorrect use can lead to condom failure. If enough people did not use condoms correctly every time in these studies, this will result in a lower estimate of condom effectiveness than if condoms had been used correctly.
  • The available studies also relied on self-reported condom use to determine if participants were consistent condom users. We know that participant self-reports in studies are an unreliable way of measuring certain types of behaviours, particularly those that are considered socially undesirable such as sex without a condom. If enough people over-reported consistent condom use this will result in a lower estimate of condom effectiveness than if condoms had actually been used consistently.
  • Finally, all of these studies were observational, which means that people were not randomized to use condoms or not. Without randomization, the two groups (those that used condoms consistently and those that did not) may be different on some very important factors, other than condom use, that might better account for the low level of effectiveness found in these studies.

Based on the studies that assessed the mechanical properties of condoms (permeability, breakage, slippage and leakage) we conclude that condoms, when combined with a comprehensive sexual health plan, are a highly effective strategy for reducing the risk of the sexual transmission of HIV when used consistently and correctly. However, observational studies suggest that a high level of effectiveness may be difficult to achieve for some people.


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