Authors in War
Many of the authors that served in various real-life wars (and survived) wrote stories that are at least somewhat based on their own experiences. Some of them are outright memoirs or fictionalized accounts of their exploits.
... vaginal opening.
In the human male, the urethra is about 8 inches (200 mm) long and opens at the end of the penis.
Medical problems of the urethra:
...