The urethra is the tube that conducts the flow of urine in both sexes from the interior of the body to the external world. In males, semen also travels through the urethra during sexual intercourse.
The urethra connects the bladder, the collection site for urine to the outside world. In males, the urethra is 8 inches long,
while in females, the urethra is only 2 inches long. So the primary difference is one of length.