I've had a strong burning sensation while peeing, and, a yellow puss-like discharge from my penis, what are possible causes of this?

Gonoohea or a UTI: Yours are the classic symtoms of gonorrhea (gc). Have you had unprotected sex with a partner who may have gc?. Perhahs you have some other kind of urethritis, but, you must get this checked out asap. Good luck.

Discharge from penis: There are many things that could be causing your symptoms but the most concerning would be that you have been exposed to a sexually transmitted disease. You need to be seen by a health care professional as soon as possible, and until you are seen by a dcotor i would adivse you to stop having sexual relations. If you do not have a regualr doctor an urgent care or health clinic can see you for this.

Probably an STD.: You will need to be checked by a doctor to screen you for gonorrhea and chlamydia as soon as possible and then treated. Meanwhile no unprotected sex until you have completed treatment.

STD: I agree. I would also suggest that if the test results reveal that you do have a std, then all your partners be notified so that they can be tested and treated (if necessary). Again, using a condom and practicing safe sex can almost completely prevent a std.