Urethral stricture refers to a condition where the urethra (the tube connecting the bladder and the penis in men and to the urethral opening in women) narrows down restricting the free flow of urine causing symptoms and complications if left untreated.
Urethritis makes it difficult and painful to urinate and ejaculate (in men). Urethritis can be caused by either bacteria or virus or other medical conditions. Treatment is aimed at the cause of urethritis.
In some men, penis becomes even more sensitive that they may feel a tingling kind of uncomfortable feeling or if they are aroused, they may just ejaculate within a few seconds. The most bothersome condition with a sensitive penis is when a man ejaculates within a minute after vaginal penetration during sex.