The World Health Organization has said oral sex is producing dangerous gonorrhoea and a decline in condom use is helping it to spread.
It warns that if someone contracts gonorrhoea, it is now much harder to treat, and in some cases impossible.
The sexually transmitted infection is rapidly developing resistance to antibiotics.
About 78 million people pick up the STI each year and it can cause infertility.
The World Health Organization analysed data from 77 countries which showed gonorrhoea's resistance to antibiotics was widespread.
A decline in condom use, which had soared because of fears of HIV/Aids, is thought to help the infection spread.
The fact that gonorrhoea can infect the throat is really concerning health officials.
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