What are causes of uti in 23 year old male ?

Not common: Because the urethra is longer, UTI's are not very common in young males. Symptoms of pain with urination, frequency, and discharge are more likely due to a sexually transmitted disease such as chlamydia or gonorrhea. It is important to tell your doctor your symptoms, he or she can run tests and provide the appropriate treatment. Here is some info; http://emedicine.medscape.com/article/231574-overview