Sexuality in Christian demonology
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The sexuality of demons 
To Sumerians, Babylonians, Assyrians, and Jews there were male and female demons (Jewish demons were mostly male, although female examples such as Lilith exist). In Christian demonology and theology the matter of the sexuality of the demons is not clear. They may variously be considered male or female, but the general view is that they are masculine and feminine, while not actually being of either sex. This is the general view of the angels as well, who are generally considered sexless. One possible exception is the Grigori who, led by Azazel, descended on Mount Hermon and copulated with earthly women out of lust.
Other conceptions posit that beings of spiritual substance are gender-transcendent or otherwise non-gendered; the experience of a demon as having gender and directional sexual tendencies would be the result of the purposes of the demon in tempting, deceiving, or otherwise harming human targets. John Milton upholds this view in Paradise Lost, specifying that although demons may seem masculine or feminine, spirits "Can either Sex assume, or both; so soft And uncompounded is thir Essence pure". It is of note that although God is predominantly experienced and self-revealed as male in the Hebrew Scriptures and Christian New Testament, the Hebrew Scriptures and their Greek translation - the Septuagint - contain feminine allusions to God (e.g., "El Shaddia" referring to breast, hence a nurturing image; "Lady Wisdom", often paralleled to the Word of Gospel of John chapter 1, whose incarnated form is Jesus; the Holy Spirit has feminine references, etc.) although this is due to the Hebrew word form of "wisdom" being a feminine word, hence a masculine personification would not make sense for literary purposes. The notion that God is then gender-transcendent but self-revealed as male for purposes of revelation could also carry over to angels and demons.
By supporting the idea that demons could rape women and sexual relationships with them were painful, Nicholas Remy assigned a sadistic tendency to their sexuality.
Lust in demons 
Lust in demons is a controversial theme for Christian demonology, and scholars disagree on the subject.
Early advocates 
Augustine of Hippo (5th century), Hincmar (early French theologian, archbishop of Rheims, 9th century), Michael Psellus (11th century), William of Auvergne, Bishop of Paris (13th century), Johannes Tauler (14th century), and Ludovico Maria Sinistrari (17th century), among others, supported the idea that demons were lustful and lascivious beings.
Early opponents 
Plutarch (1st and 2nd centuries), Thomas Aquinas (13th century), Nicholas Remy (16th century), and Henri Boguet (16th and 17th centuries), among others, disagreed, saying that demons did not know lust or desire and cannot have good feelings like love; as jealousy would be a consequence of love, they could not be jealous. Ambrogio de Vignati agreed with them.
Intermediate views 
Heinrich Kramer and Jacob Sprenger (15th century), authors of the Malleus Maleficarum, adopted an intermediate position. According to their book, demons did not feel love for warlocks or witches. This is because sexual relationships with them were a part of the compromise these men and women made together with the diabolical pact to honour them by humiliating themselves conceding what demons could sexually ask from them. Demons acting as incubi and succubae with common people were passionate lovers that felt the desire of being with their beloved person and have sexual intercourse with him/her.
Augustine, Hincmar and Psellos thought that lust was what led demons to have sexual relationships with humans. William of Auvergne, conceived the idea that demons felt a particular and morbid attraction by long and beautiful female hair, and thus women had to follow the Christian use of covering it to avoid exciting desire in them. Tauler had the opinion that demons were lascivious and thus they wanted to have sexual intercourse with humans to satisfy their lewdness. Sinistrari supported the idea that demons felt sexual desire, but satisfaction and pleasure were not the only motivation to have sexual relationships with humans, being another reason that of fecundating women.
Plutarch wrote that demons could not feel sexual desire because they did not need to procreate, his work inspiring later Remy's opinion. Thomas Aquinas asserted that demons could not experience voluptuousness or desire, and they only wanted to seduce humans with the purpose of inducing them to commit "terrible" sexual sins. Remy wrote that "demons do not feel sexual desire inspired by beauty, because they do not need it to procreate, having been created since the beginning in a predetermined number". Boguet said that demons did not know lust or voluptuousness "because they are immortal and do not need to have descendants, and so they also do not need to have sexual organs", so demons could make people imagine that they were having sexual relationships, but that actually did not occur. Vignati agreed with Boguet saying that sexual relationships with demons were imaginary, a mere hallucination provoked by them, and Johann Meyfarth agreed too.
Pierre de Rostegny supported the idea that Satan preferred to have sexual intercourse with married women to add adultery to other sins like lust, but told nothing about his lust or that of his companions.
In fiction 
Supporting the idea that demons had feelings of love and hate, and were voluptuous, there are several stories about their jealousy.
The first story of this type is narrated in the deuterocanonical Book of Tobit, in which the demon Asmodeus either fell in love with Sarah or felt sexual desire for her (or both). Out of jealousy, Asmodeus killed seven of her husbands before the marriages could be consummated. Asmodeus never had sexual intercourse with Sarah, and intended to kill Tobias, her eighth husband, but was foiled by the angel Raphael.
Another of these stories about demonic lewdness and passionate love is told in The Life of Saint Bernard, written by a monk, and said that during the 11th century a demon fell in love with a woman, and when her husband was asleep he visited her, awoke the woman and began to do with her as if he were her husband, committing every type of voluptuous acts during several years, and inflaming her passion.
A story referring to demonic jealousy was told by Erasmus (16th century), who blamed a demon for the fire that destroyed a village in Germany in 1533, saying that a demon loved deeply a young woman, but discovered that she had also sexual relationships with a man. Full of wrath, the demon started the fire.
Sexual relations 
Christian demonologists agree that sexual relationships between demons and humans happen, but they disagree in why and how. A common point of view is that demons induce men and women to the sin of lust, and adultery is often considered as an associated sin. Pierre de Rostegny supported the idea that Satan preferred to have sexual intercourse with married women to add adultery to her sins.
It was considered that demons always had sexual relationships with witches and warlocks in the form of incubi and succubae, and some witches had sexual intercourse with a male goat, as it was supported by Pierre de Rostegny. But common people, as it was believed, also were seduced by incubi and succubae, especially while they were asleep, and sometimes when they were awake, in the form of a beautiful man or woman that excited their desire to the point of not being able to resist the temptation, although the possibility of resistance always existed as asserted by Christian theologians, but the tendency to sin was stronger than their faith. Francesco Maria Guazzo offered detailed descriptions of sexual relationships between demons and humans.
Nicholas Remy, disagreeing with many theologians and demonologists, supported the idea that even if a woman opposed resistance to the demon he could rape her, and wrote about a case of a young teenager that "was raped twice the same day by a demon, although she opposed resistance, and, not being her body enough mature to receive a man, she almost died because of the hurts". Catherine Latonia confessed this case to him in 1587. Whether the confession was an excuse to avoid giving the name of the rapist or the girl actually thought that a demon had raped her, will remain unknown. Sylvester Prieras agreed with Remy, supporting the idea that demons could not only rape common women but also nuns.
The Malleus Maleficarum established that sexual relationships between demons and humans were an essential belief for Christians. But its authors considered also the possibility that demons provoked a false pregnancy in some women, filling their belly with air due to certain herbs they made them drink in beverages during the Sabbaths; at the time of giving birth to the child, a big quantity of air escaped from the woman's vagina. The false pregnancy was later explained by medicine.
Many Christian theologians (Martin Luther and Jean Bodin among others) believed that demons could impregnate women but their children would have a short life and be good for nothing; other theologians (Francisco Valesio, aka Valesius, Tomaso Malvenda and Johann Cochlaeus among others) thought that these children could be important characters, like Attila, Martin Luther, Melusine or the Antichrist.
Augustine of Hippo, Pope Innocent VIII, Albertus Magnus, Thomas Aquinas, Peter of Paluda, Martin of Arles and Ludovico Maria Sinistrari believed that demons could fecundate women, but Ulrich Molitor, Heinrich Kramer, Jacob Sprenger and Nicholas Remy disagreed.
According to Remy, sexual relationships with demons were painful, meanwhile many persons that confessed to have had those relationships told that they were satisfying.
This interpretation is disputed by some, who claim that "sons of God" in that text refers only to believers in the "Promised Seed" (Genesis 3:15) and that "daughters of men" refers to pagan women, particularly implying that descendants of Seth were marrying descendants of Cain.
Under this interpretation, the Nephilim were not physical giants, but just men without conscience who were extremely evil and aggressive. This interpretation limits the direct roles of demons on the early human race to merely a role as being influential to human affairs, without actually engaging in sexual relations with humans themselves. Under this, the Nephilim were not part-man and part-demon, but were full-blooded men that were particularly susceptible to demonic influence over their actions.
The key argument defending this interpretation is that demons had no need to mate with humans and turn them against God, but only a need to stop the entire human race all at once from having faith that it would be promised a savior from sin, which would guarantee the damnation of all humanity at once, thereby allowing Satan to fulfill his revenge against God for expelling him from Heaven.