Jul 06, 2017 · The urethra starts at the urethral bladder opening, around 3 cm behind the pubic symphysis, then passes through the urogenital diaphragm, only to end with the external urinary tract, which is located the vaginal vestibule. This has an oblique, downward and rearward trajectory. There are 2 parts described: Pelvic; Perineal.. Watch free extreme male urethra stretching videos at Heavy-R, a completely free porn tube offering the world's most hardcore porn videos. New videos about extreme male urethra stretching added today!. Ejaculation is the endpoint of a process that begins with a touch. Skin covering the shaft and glans of the penis is filled with nerve endings sensitive to pressure and vibration. Stroking that. Causes. Injury or damage to the urethra can heal with scar tissue that may cause a stricture. There are various types of injury that can damage the urethra. For example: an injury may occur during medical procedures to look into your bladder via your urethra; radiotherapy treatment may damage your urethra; a fall astride on to the frame of a bike can cause damage.