Anyone who has sex can have an STI.
It doesn’t just happen to ‘bad’ people and people who sleep around – it can happen to anyone even if they only have sex once. Most of the time, people can’t tell if they have an STI so it’s always worth getting tested, and getting your partner tested if you are in a relationship.
Rashes, sores, burning, smelling, itching and generally feeling unwell are some symptoms that you may have an STI. BUT most people don’t have any signs or symptoms that they have an STI so always get checked!