How often does penile discharge come out when you have an std?

Sometimes: Penile discharge is a symptom of some of the more common std's, such as chlamydia and gonorrhea. However, some people can be infected with either of these germs and have no symptoms at all. But they could easily transmit the germ to someone else. Precautions should be taken regardless of the presence or absence of symptoms. Many std's, including hiv, hepatitis b and syphilis, don't cause discharge.