While the skin and surface organs of vampires appear like those of the living, most of their internal organs will rot until they are nothing but liquid. The exceptions are the bladder, bowels, sinuses, and the sexual organs. All these organs cease to serve any function, with one exception: vampires may engage in an imitation of the act of intercourse, but do not receive any sensation thereby, and lose the desire to do so, although they may use it to pass for human and put their prey off guard.
It is said by some that these organs retain their wholeness so that the vampire’s rotting innards do not spill out of their bodily orifices. Others question why these orifices do not seal up instead. They suggest that the sexual organs provide the restless energy that, in the absence of any sexual drive, spurs the vampire to create more of its kind.