Anal Sex And UTI: 5 Critical Facts

Unfortunately, anal sex and UTI are often connected. If you understand the mechanics of urinary tract infection, it is easy to see how anal sex can cause a UTI if you are not extremely careful.

#1 Why Anal Sex Causes UTI

Pathogenic bacteria

There are plenty of bacteria that live in our lower intestines and are found in human feces and anal cavity. However, if they stay where they are meant to be, they are harmless and even helpful.

For example,  E. coli strains produce important vitamins, such as vitamin K and B-complex vitamins, which we absorb.

At the same time, E. coli are responsible for 90% of UTIs worldwide when they ascend to the bladder.

Therefore, when E. coli bacteria are mechanically moved from your anal cavity towards your urethra, they might be able to eventually invade your bladder, causing a UTI.

Remember, bacteria are tiny, you can’t see them. Even if everything looks clean, there are bacteria on genitals or hands if they came in contact with the anal area.

Wrong lube

Moreover, anal sex is impossible without lube.

Unfortunately, many popular brands available in pharmacies could increase female’s risk to contract a UTI if lube contains glycerin or sorbitol.

So even if you are extremely cautious about not letting any cross-contamination to happen but you are using a lube that disrupts vaginal flora, this could be a risk factor for UTI.

Read about lube that doesn’t cause UTI.

#2 Anal sex and UTI in women

For women, the risk of UTI is always higher, because our urethra is shorter than men’s. Basically, E. coli bacteria have to travel a smaller distance toward the bladder and they can reach it faster.

What’s more interesting, under certain circumstances E. coli bacteria could colonize a vagina. This is actually pretty easy because vaginal opening is so close to the anus.

However, a healthy vaginal flora is capable of “kicking out” E. coli bacteria and not letting it grow. On the other hand, if your vaginal flora is compromised, the pathogenic bacteria will grow and eventually travel further.

As you can imagine, no matter how clean you are, it’s easy to move E. coli bacteria around on the surface of your genitals during anal sex.

Eventually, some of the bacteria will get into your vagina and then ascend to your urethra, that’s how UTI happens.

#3 Unprotected anal sex and UTI in men

But what about men? Well, even if you are lucky to have a quite long urethra, it’s better to wear a condom. The anus might look visually clean, but bacteria are still there.

If you decide to go for it without a condom, make sure to pee soon after sex to flush out any E. coli bacteria that are climbing your urethra.

Statistically, though, UTI in men is caused by other health problems and a healthy guy is unlikely to contract a UTI from unprotected anal sex.

#4 Ground rules for anal sex to reduce the risk of UTI

In respect to UTI safety, here are couple important things to remember:

  • Vaginal before anal: it is safer if anal sex is the last thing you do before you go pee and take a shower.
  • Discard your condom after anal sex, obviously, do not use the same condom for vaginal penetration.
  • Use different hands for anal and vaginal play. Reserve one hand (or finger) for anal play only.
  • Use better lube.

#5 How to prevent UTI if having frequent anal sex

Basic rules include:

  1. Pee after sex (both heterosexual partners)
  2. Good hygiene before and after
  3. Consider supplements such as probiotics to keep your vaginal flora well balanced (females) and D-Mannose (both heterosexual partners)
  4. Look for a quality lube that does not promote the growth of opportunistic bacteria

My UTI Guides

  1. 8 Holistic Strategies To Prevent UTI
  2. 7 Unexpected Facts About Vaginal Discharge And UTI
  3. Oral Sex And UTI: All You Need To Know
  4. Can I Get a UTI From My Partner?


  1. Can women get UTIs through vaginal even if they don’t have sex with a man that puts his penis inside of a vagina after anal sex? Like, if the sex involves zero anal & only vaginal? They say the vagina is cleaner than the anus.

    • Hi Tyler, please check out this post to better understand the role vagina plays in UTI prevention. Basically, bacteria colonizing the vagina move around on their own, but any additional “activity” could contribute to them ascending further towards the urethra.

  2. Hi I started getting UTI after having my last baby and also tided my tubes it’s been a little over a year and I’ve got around 6 UTI infections I don’t know what to do or how to start to help my self, but it’s killing me I’m 34 years old I need advice please help.

  3. Olive oil as a lubricant helps (along with good hygiene). It’s a natural anti bacterial and some studies show that it kills e-coli. Since we started using olive oil 8 months ago my wife hasn’t had any UTIs.


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