In Demonology, this topic is one of the most frequent and debated by all the Warlocks, witches and demonologos.

Although some novels, such as the Satanic "Rosemary baby" have banalised theme, it is not surprising that it still persists in society the dark memories of incubos utilized by Satan in the belly of unwary maidens, used as a means to regenerate the evil on Earth.

But the scholars prefer to consult the ancient sages before that let us take films or urban myths. An example is the ancient book hammer of witches (Malleus Maleficarum), published in Cologne in 1486, written by Jakob Spenger and Heirinch Kramer. There we can read:

"There are cases in which the women believe have conceived of an Incubus; their bellies become bulky, but when comes the time of the third stage of swelling disappears, because giving in their drinks spurge or black pine seeds, large volume of air that the demon refuses, leaving it"