In a few men, certain internal muscles operate in such a way that the semen is not ejaculated to the outside, but instead into the bladder from where it then later is passed off with the urine.

• 在少数男性，他们的生殖管道平滑肌以这样的一种方式运作：精液不是被射到体外，而是射进了膀胱，然后再从膀胱随著尿液一起排出体外。