Over the centuries, there have been many reported cases - especially in Medieval legend - of sexual hauntings involving two specific types of entities: the Incubus (male demon) and the Succubus (female demon).
The Incubus and Succubus usually manifest themselves during the nocturnal hours, preying on the victim when they are sleeping, although there have been some cases where females have actually been sexually assaulted whilst fully awake. One such experience was covered in the book and subsequent movie,The Entity.
Any female who undergoes an incubus sexual assault will not awaken, although she may experience it in a dream. If she becomes pregnant, the child will grow inside her as any normal child, except that it will possess supernatural powers. Usually the child grows into a person of evil character or a powerful wizard. According to legend, it is said that the magician Merlin was the result of physical contact between an incubus and a nun.
A succubus is the female version, and she seduces men. According to one legend, the incubus and the succubus were fallen angels. The word incubus is Latin for "nightmare". Succubus - In medieval European folklore, a female demon (or evil spirit) who visits men in their sleep to lie with them in ghostly sexual intercourse. The man who falls victim to a succubus will not awaken, although may experience it whilst in the dream state. The biblical Lilith, the first wife to Adam before Eve, is said to also have been the very first succubus on earth. There is a version of the Lilith myth in EVERY religion in the world. Many of these creatures have different names, such as Marilith or Lilitu, but all of them have one common theme: a demon woman, often with wings, who seduces - and sometimes murders - men. A succubus.
Just as is the case with the succubus, there are also many legends about incubi (singular: incubus), but these are not be confused with succubi (which is the plural of succubus). The incubi are said to be fallen angels in Judeo-Christianity who fell to earth because they had sex with mortal women. Since then incubi have stalked the earth, seducing women in their dreams and impregnating them. The children of incubi are said to grow up to become rapists.
An evil person who raped and murdered in real life may pass on, but may not move on to Heaven or Hell. Instead, they remain on the earth plane as a spiritual being with the same personality as they had in life. They are therefore free to indulge in sexual intercourse with whoever they chose, so it’s not surprising that a spirit of such a nature may be called an Incubus or a Succubus.
There are many variations of this sexual demonic legend all over the world. For instance, in Zanzibar, an entity known as the "Popo Bawa" generally preys on men as they sleep in their beds. In the Chilo‚ Province of Chile, a pathetic little dwarf, known as El Trauco, woos young naive women and then seduces them. In Hungary, a Liderc is a demonic sexual predator that operates under the cover of darkness, and will appear as little more than a wispy apparition or a fiery light. Any one of these two succubus's can be blamed for unexpected or unwanted pregnancies, especially in unmarried women, though you could argue that it might just be a convenient fabrication to avoid vicious gossip!
Some confuse the incubus with the legendary "Old Hag" syndrome, but it is not. The Old Hag episode is usually confined to a feeling of intense pressure on the chest and, as such, not an actual ghostly sexual encounter. Another difference that separates the incubus/succubus experience from the Old Hag is that the former is not always unpleasant while the Old Hag is mostly accompanied by a feeling of death, suffocation and the horrific feeling of fighting for your life.
Because the incubus and succubus are generally experienced during the sleep state or in between it, most experts feel that it is an imaginary experience and not a real one. However, telling this to the person who has just had this eerily erotic experience, they may find that hard to believe, as to them it feels as real as actual sexual intercourse itself.
Nobody can really say for sure if these events are real or imagined, but until you've experienced an actual sexual assault by an incubus or succubus yourself, it's quite hard to form a solid opinion one way or the other.