If you are having sex and you are not using a condom then you are at risk of catching any of the following STIs:
Chlamydia - in 2010 there were 186,753 diagnosis of chlamydia in England. Many people who have the infection do not know that they have it as often there are few symptoms. It is therefore recommeded that you get tested for the infection at either a sexual health clinic or at your doctor's surgery. If you are under 25 years old you can get tested under the National Chlamydia Screening programme. The infection should be treated with antibiotics, as if left untreated it can spread to other parts of your body and lead to long-term health problems.
Genital Herpes- causes painful blisters to appear on the genitals and the surrounding areas. It is highly contagious and causes a chronic long-term condition for which there is no cure. The symptoms can usually be controlled with medication, which is available from your doctor or a sexual health clinic
Genital warts - are small fleshy growths or skin changes that appear around the genital or anal area. Genital warts can be spread during vaginal or anal sex, or by just touching infected skin. The warts are painless, but unsightly and can be treated with medication.