The main difference between condom types is the material: latex and polyurethane both block the genital fluids that carry HIV, gonorrhea, chlamydia, and trichomoniasis, while lambskin (natural-membrane) condoms have tiny pores that do not stop STIs or viruses, even though they prevent pregnancy. Latex is the standard; polyurethane and polyisoprene are the go-to alternatives for latex allergy.
used consistently and correctly
reduced, not eliminated
| Item | Value |
|---|---|
| Fluid-borne (HIV, gonorrhea, chlamydia, trich) | strong — used consistently and correctly |
| Skin-to-skin (herpes, HPV, syphilis) | partial — reduced, not eliminated |
What each condom type actually is
Condoms come as two broad designs and a handful of materials. The design is either external (the rolled sheath that goes over an erect penis, sometimes called a "male" condom) or internal (a pouch inserted into the vagina or anus, sometimes called a "female" condom). Used consistently and correctly, both are a barrier method that's highly effective at preventing the sexual transmission of HIV CDC. The material is what separates the types, and where most of the confusion sits.
Latex condoms
Latex is natural rubber and the most common, best-studied condom material. It's stretchy, strong, and an effective barrier against the fluids that carry HIV and other fluid-borne infections. Latex breaks down when it touches oil. Use only water-based or silicone-based lubricants with it — baby oil, lotion, petroleum jelly, and cooking oil all weaken latex and cause it to tear CDC.
Polyurethane condoms
Polyurethane is a thin plastic. It's the main option if you or a partner has a latex allergy, and it conducts heat well, which some people prefer for sensation. Unlike latex, it works with oil-based lubricants. It's less stretchy, though, so it can fit looser and is somewhat more prone to slipping or breaking than latex if the fit is off.
Polyisoprene condoms
Polyisoprene is a synthetic version of rubber. It feels close to latex and stretches like it, but contains none of the natural-rubber proteins that trigger latex allergies. Like latex, it should be paired only with water- or silicone-based lube. For most people with a latex sensitivity who want a latex-like feel, this is the comfortable middle ground.
Lambskin (natural-membrane) condoms
Lambskin is made from the intestinal membrane of a sheep. The membrane has microscopic pores large enough for viruses and bacteria to pass through. It can prevent pregnancy by blocking sperm, but it does not protect against HIV or other STIs. If STI protection is any part of your reason for using a condom, lambskin is the wrong choice.
Internal condoms
Internal condoms are a soft pouch worn inside the vagina or anus rather than on the penis. They're typically made of nitrile, so they work with any lubricant and suit people with latex allergies. They put control of the barrier in the receptive partner's hands. If you've never used one, the technique is a little different from rolling on an external condom, so see our walkthrough on female condoms.
The key differences that change your protection
Two distinctions decide whether a condom protects you. The first is material. Latex, polyurethane, polyisoprene, and nitrile all block fluid; lambskin does not. The second is what the condom can physically cover. Condoms work best against STIs spread by genital fluids — HIV, gonorrhea, chlamydia, and trichomoniasis — because the barrier stops the fluid contact those infections need to spread CDC STI Guidelines, 2021.
They offer less protection against infections spread by skin-to-skin contact: genital herpes, HPV, and syphilis. A sore or patch of infected skin can sit on the scrotum, the base of the penis, or the surrounding skin a condom doesn't cover, so transmission can still happen even with perfect use. Condoms still cut the risk meaningfully, so keep using them, and pair them with regular testing and, where relevant, the HPV vaccine.
Condom types side by side
| Material | Blocks HIV & fluid-borne STIs? | Latex-allergy safe? | Oil-based lube OK? | |
|---|---|---|---|---|
| Latex | Yes | No | No — water/silicone only | |
| Polyurethane | Yes | Yes | Yes | |
| Polyisoprene | Yes | Yes | No — water/silicone only | |
| Nitrile (internal) | Yes | Yes | Yes | |
| Lambskin | No — pores let viruses through | Yes | Yes |
Which condom type is right for you
Most people can use the simplest answer: a standard latex condom with water- or silicone-based lube. From there, adjust for your situation.
- You or a partner has a latex allergy: choose polyisoprene (latex-like feel) or polyurethane, or an internal nitrile condom — all of them block STIs.
- You only have oil-based lube on hand: skip latex and polyisoprene; polyurethane and nitrile tolerate oil. Better yet, keep water- or silicone-based lube nearby so latex stays an option.
- You want the receptive partner to control the barrier: an internal condom is designed for that.
- You're choosing lambskin for any reason involving infection: don't. It prevents pregnancy only and leaves you unprotected against HIV and STIs.
The practical next step: using whichever type correctly
The material matters less than the technique. Most condom failures trace back to user error rather than the product — putting it on after contact has already started, using oil-based lube on latex, or reusing one. The fix is the same regardless of type CDC:
- Put the condom on after the penis is erect and before any genital, oral, or anal contact with a partner.
- Pinch the air out of the tip, then unroll it all the way down — trapped air in the tip is a common cause of breakage.
- Use a new condom for every sex act, whether oral, vaginal, or anal.
- After sex, hold the condom at the base while pulling out so it doesn't slip off.
- Check the expiry date and store condoms somewhere cool. A wallet or a hot glovebox degrades latex, so don't stash your only one there for months.
Condoms reduce the risk of STIs and pregnancy but don't make either impossible, and they have to be used every time to work. They also pair well with other prevention: for couples where one partner has HIV, treatment that lowers viral load is part of the picture, and you can read how earlier hiv treatment can help prevention.
When to talk to a clinician
See a clinician — or test on your own timeline — if a condom broke or slipped, if you had unprotected contact, or if you have symptoms like discharge, burning when you pee, sores, or unusual genital irritation. A broken condom doesn't mean you've definitely caught something, but it does mean testing is worth it. You can get tested confidentially, and because infections don't show up instantly, it helps to know when to test after exposure so you don't test too early and miss something.
Bring up a recurring latex reaction (itching, redness, or swelling after use) with your doctor too — it may be a latex allergy, and switching to polyisoprene, polyurethane, or nitrile usually solves it.