Students at Isaac Newton Academy in Ilford conceived the idea as a way to help prevent the spread of STIs.

Inventors of the smart condom won first place in the TeenTech awards, bagging £1,000 prize money and a trip to Buckingham Palace.

Dubbed the 'S.T. EYE,' the condom features a layer of antibodies that interact with the antigens of sexual diseases, causing the rubber sheath to change colors depending on the disease.

The condom could turn green for chlamydia, yellow for herpes or blue for syphilis, the designers explained.