Hello Thanks for query . Based on the facts that you have posted passing yellow coloured discharge form penis and burning urination after sex is mostly due to infection of urethra (Urethritis) and needs to be confirmed by doing following basic tests 1) Routine urine test and urine culture 2) Swab test and culture of a discharge from the urethra. Start taking antibiotic like Cefotaxime and Nitrofurantoin twice daily along with urine alkalizer like Citralka thrice daily later on switch on to appropriate antibiotic as per culture report . Ensure to wash your genital with waarm water twice daily Ensure to drink more water to keep your urine dilute Ensure to avoid sexual encounters with female other than your wife . Dr.Patil..