Succubus

Succubus is a demon who takes the form of a woman to seduce men in dreams to have sexual intercourse. In modern times, a succubus is often depicted as highly attractive, while in the past succubi were frightening and demonic. The male counterpart is the Incubus.

Succubi draw energy from men to sustain themselves, often until the victim becomes exhausted or dies. In one such story, a man in the town of Koblenz is bewitched by a succubus, with whom he is forced to repeatedly fornicate in the presence of his wife. The story says that, "After an incredible number of such bouts, the poor man at last sinks to the floor utterly exhausted and disgusted beyond belief."

A succubus collects semen from the men she sleeps with, which incubi then use to impregnate women, thus explaining how demons could apparently sire children despite the traditional belief that they were incapable of reproduction. Children so begotten were supposed to be those that were born deformed, or more susceptible to supernatural influences.