If u guy has a yellow discharge and he only slept with one girl and that girlfriend only slept with her... what is wrong with the guy... can it be gonorrhoea? If yes.. how because both of them are faithful with no doubt...

Penile discharge is the abnormal loss of fluid that is not urine or semen from the urethra (urine tube) at the tip of the penis. It is commonly the sign of a sexually transmitted disease (STD), and requires prompt and accurate diagnosis and treatment, usually by staff at a specialist genitourinary medicine (GUM) or STD clinic.

Yellow discharge is a symptom of gonorrhea.

Gonorrhea doesn't cause symptoms in most women, so your partner could have had it from a previous sexual partner and not known it.

You both need to go to the doctor and get checked.

Time for a visit to the doctor for a proper diagnosis.