# Condoms: external & internal

> The only method that protects against STIs too – here’s how to use them right.

Category: Contraception · 5 min read · Written by the Splash team · Sources checked October 2026
URL: https://splash.care/learn/contraception/condoms

## Quick answer

- Condoms are the only method that also protects against STIs.
- External: 98% perfect, 82% typical. Internal: 95% perfect, 79% typical.
- Never double up; avoid oil-based lube with latex.
- Condom accident? Think emergency contraception and an STI test.

Condoms are the only [contraception](https://splash.care/learn/contraception/methods-overview) that also helps protect against STIs, including HIV. Using one alongside another method (sometimes called “double Dutch”) gives you great [pregnancy](https://splash.care/learn/fertility-ttc/early-pregnancy-signs) protection plus [STI](https://splash.care/learn/glossary/sti) protection.

**98% / 82%** External condoms: perfect use vs typical use (NHS)

## External condom how-to

1. Check the expiry date and look for a CE or UKCA mark.
2. Open carefully – no teeth!
3. Put it on before the penis touches the [vagina](https://splash.care/learn/glossary/vagina) or anus, once fully erect.
4. Pinch the tip to squeeze out air, then roll all the way down. If it won’t roll, it’s inside out – bin it and start fresh.
5. Hold the base when pulling out. Bin it (not the toilet).

## Internal condoms

Internal (sometimes called female) condoms go inside the vagina or anus, and you can put one in up to 8 hours before sex. They’re 95% effective with [perfect use](https://splash.care/learn/glossary/perfect-use) and 79% typically. Make sure the outer ring stays outside and the penis goes inside the condom.

## Golden rules

- New condom every time
- Never use two at once (including an internal plus external) – friction makes them split
- Oil-based lube (like coconut oil or Vaseline) damages latex – use water- or silicone-based
- Latex allergy? Choose latex-free

> **Splash says:** keep condoms somewhere cool, not in a back pocket or car glovebox. Heat and friction weaken them.

**Myth:** Condoms ruin the mood.

**Fact:** Putting one on can be part of foreplay – and peace of mind is pretty sexy. Try different sizes, textures and thinner styles to find what feels good.

### When to see a doctor

If a condom splits, slips off or leaks, get help quickly from a pharmacist, sexual health clinic, GP or 111. You may need emergency contraception and an STI test.

## Sources

1. [NHS – Condoms](https://www.nhs.uk/contraception/methods-of-contraception/condoms/)
2. [NHS – Internal (female) condoms](https://www.nhs.uk/contraception/methods-of-contraception/internal-condoms/)
3. [ACOG – Barrier methods of birth control](https://www.acog.org/womens-health/faqs/barrier-methods-of-birth-control-spermicide-condom-sponge-diaphragm-and-cervical-cap)

This is general information, not medical advice. Splash can’t diagnose. If you’re worried, talk to a GP, pharmacist or sexual health clinic. In an emergency call 999 (UK) or 911 (US).