Why does it burn when you pee in the morning?

A burning sensation during urination is called disuria and is a symptom of gonorrhea (the clap). Often, but not always, it is accompanied by a discharge. If you are having pain during or just after urination you should see your doctor or health department. They can evaluate your symptoms and treat you accordingly.

You should not have sex until you have been to the doctor and he tells you it's okay to do so. Gonorrhea is infectious and you can infect someone else while you have symptoms and possibly be reinfected yourself later as a result.