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KS3 Sexually Transmitted Infections

Sexually transmitted infections are on the increase, particularly amongst the young adult population. This section aims to teach students how sexual activity can lead to the spread of microbes and disease. Students observe how easily potentially harmful microbes can transfer to the people you care about without either of you knowing.

  • Overview

What will you learn:

This lesson on Sexually Transmitted Infections teaches students how easily potentially harmful microbes can transfer to the person you care about without either of you knowing.

Activities include:

  • A chemical experiment to see how many people can be infected unknowingly by unprotected sexual intercourse (exchange of body fluid) and how we can prevent this from happening.
  • A comic strip where two characters make some good and bad decisions, allowing students to discuss just how wise these decisions are and how relevant they are to them.

Learning Objectives:

  • Understand that infection can be spread easily through sexual contact.
  • Understand what they can do to protect themselves against STIs.
  • Understand that non-barrier forms of birth control do not protect against STI.
  • Know that not everyone with an STI has symptoms.


  • Clean test tubes
  • Test tube rack
  • Iodine
  • Starch
  • Water
  • Gloves
  • Cling film or cotton balls

Curriculum Links:

  • Science: Working Scientifically, Experimental skills and investigations, Analysis and evaluation
  • RSHE: Health & Prevention, Intimate and sexual relationships, Including sexual health
  • GCSE: Health and social care
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e-Bug is a free educational resource, operated by Public Health England, which contributes to the government’s ongoing action plan to tackle antimicrobial resistance. e-Bug resources make learning about microbes, antibiotics and the spread and treatment of infection, engaging and accessible.


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