http://dictionary.reference.com/browse/ejaculatory
Ejaculatory incompetence: the inability to ejaculate within the vagina despite a firm erection and relatively high levels of sexual arousal.
Yes.
Urethra
The vas deferens carries the sperm to the ejaculatory ducts.
Semen is just seminal fluid plus semen. The path of the semen is: seminal vessicles, epididymis, vas deferens, ejaculatory duct, and urethra. The seminal fluid joins the semen in the ejaculatory duct. So they share the ejaculatory duct and the urethra.
In order for a female to become pregnant, there must be either pre-ejaculatory fluids or ejaculatory fluids that come in contact with her vagina.
pre ejaculatory fluids
Seminal Vesicles
Cowper's glands
Ejaculatory duct
vas deferens