Is unprotected anal sex dangerous?

Anal sex is considered a high-risk activity as the anus is prone to tearing and damage during penetration, which may increase the chances of contracting STIs. These tears can be microscopic and so not visible to the couple. Some STIs like syphilis and HPV are much more likely to seed into damage tissues.

The risk is also higher for the man who penetrates, as these microscopic quantities of blood may pass more easily through the lining of the head of the penis.

The risk increases if proper precautions are not followed. The anus is also lined with delicate tissues that can be easily damaged, and this can lead to tearing, bleeding, and other health complications. The mucous membrane of the rectum absorbs fluids so any semen or pre-ejaculate infected with viruses like HIV will be more easily absorbed, compared to vaginal sex.

Anal sex is considered a high-risk activity as the anus is prone to tearing and damage during penetration, which may increase the chances of contracting STIs.

The risk increases if proper precautions are not followed. The anus is also lined with delicate tissues that can be easily damaged, and this can lead to tearing, bleeding, and other health complications.

Engaging in unprotected anal sex can increase your risk of contracting many STIs. Most STIs that you get in your genitals you can get in your rectum, the most common among them being:

• Gonorrhoea
• Chlamydia
• Syphilis
• Herpes
• HPV
• HIV
• Hepatitis B
• Hepatitis C

HIV and hepatitis C are particularly serious as they can lead to long-term health complications and, in some cases, even death. Most of the others are easier to treat once they are detected in tests.

The best way to protect oneself from the risk of STIs when engaging in unprotected anal sex is by using a condom. It is important to use the right type of condom, and one designed for anal sex is preferable as it is thicker and provides extra protection. Using plenty of lubrication will also help reduce the risk of tearing.

It is important to remember that almost all cases of STIs in the rectum will be silent, in other words, the person doesn’t know they are infected. So getting tested is essential as a way of protecting yourself and others. This is also true for the man who penetrates. Many cases of Chlamydia, for example, will be present inside the penis without one single symptoms.

Unprotected anal sex is a risky behaviour that can lead to various STIs and other health complications. The best way to protect oneself is by using a condom designed for anal sex and using plenty of lubrication during penetration.

Regular testing for STIs after engaging in unprotected sex is also important. At Better2Know, we provide fast and confidential STI testing services across the UK. For more information, call the number above to schedule an appointment and take the first step towards better sexual health.

This article has been medically reviewed by Dr. Steve Chapman, 02/10/2025.