I have a burning sensation when ejaculate at the tip. but i'm not sexually active haven't been for a few months. i recently had stool sample an a urine test done for my job. the urine sample was giving for to see if parasites or infections. everything wa

May be normal: Since masturbation is not discussed or taught, men will tend to try out anything, using any technique. Generally if the tip of the penis is stimulated for far too long and with the application of force, the chances of penis burns increase significantly. After ejaculation, the individual will feel a burning sensation in the tip of the penis. After peeing the sensation gen subsides. Gen no infection

Seek treatment...: Burning with ejaculation can sometimes be an infection of a sexually transmitted infection such as Chlamydia. The tests for Chlamydia aren't perfect and it can be missed by a urine test. Even if you haven't recently been sexually active, the infection could be from an encounter months ago. You might consider having it treated just to be sure. Best wishes!