Gonorrhoea is a common bacterial sexually transmitted infection (STI) and caused by a bacteria which is found mainly in the semen and vaginal fluids of men and women who have the infection. Gonorrhoea is easily passed from one person to another through sexual contact. Anyone who is sexually active can get it and pass it on. You do not need to have lots of sexual partners. It can be painful and can cause serious health problems such as infertility in both men and women.