The Succubus is a female-demon, which appears in dreams, which take the female form to seduce men, mainly through sexual intercourse. In various religions, a sexual activity with one of these demons may cause odd health problems, sometimes even death. In the modern view of the Succubus, she may or may not appear in people's dreams. People which saw her mainly described her as a very attractive and seductive female, but beguiling most oftenly described her. Though in the past they were described as very demonic-like. Legend has it, Succubuses can bewitch men just by looking at them and making eye contact. If a man is kissed by a Succubus, he will become her prisoner and then she'll drain the life out of him over time until he dies.
They are always female and her equal in a male counterpart that is known as the Incubus - like all night-time spirits these entities are likely caused by ancient people's experiences with sleep paralysis (though in the case of the Incubus it was also used to cover-up rape and/or unwanted pregnancies).
In the Jewish history, it is believed that the Adam's first wife Lilith before Eve in the Garden of Eden is the first Succubus to exist. She left Adam once she got mated with Samael the Archangel. Though Samael was mated with four queens of the demons.
The Succubi mainly takes the form of a gorgeous-young women, but closer looking at her, people noticed that she has deformed body-parts of various animals. When having intercourse with the Succubus, the men enter an icy cave, in which men drip out urine on their vulvases.
In the future, people described the succubi as sirens. The Succubus collect the semen of the men they seduced. The male demons use the male semen in order to make human females pregnant. Human children which was created by these demons, appear to be more deformed and have usually vast supernatural abilities.