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

In 90% of cases, E. coli bacteria cause urinary tract infections (UTI). Otherwise, they are harmless and reside in your lower intestines and are plentiful in your anal cavity. In other words, anal sex happens in the midst of E. coli.

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

#2 Anal sex and UTI in women

For women, the risk 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 therefore have more chances to reach it.

Usually, E. coli bacteria will make a stop in a vagina and a healthy vaginal flora is capable of “kicking out” E. coli bacteria. On the other hand, if your vaginal flora is compromised, the pathogenic bacteria will grow and eventually travel further.

No matter how clean you are, anal sex moves large quantities of E. coli bacteria on the surface of your genitals. Some of the bacteria will get into your vagina and, possibly, in your urethra.

Anal sex and UTI

#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 when penetrating someone’s butt. It might look visually clean, but bacteria are still there in huge quantities.

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 hanging out in your urethra.

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

#4 Ground rules for anal sex to reduce 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. Make a mark with a permanent marker? 🙂

#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. Take probiotics to keep your vaginal flora well balanced (females)
  4. Take a preventive dose of D-Mannose (both heterosexual partners)

Stay healthy!


  1. 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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