In folklore, a succubus (plural succubi)'s a demon who takes the form of a highly attractive woman to seduce men (although the attractive part's a modern invention, historically succubi are ugly), in dreams to have sexual intercourse, according to the medieval European legend. Its male counterpart's the incubus. They draw energy from the men to sustain themselves, often until the point of exhaustion or death of the victim. One such story relates to a man in the town of Koblenz, who's been bewit… (More on Succubi)