In order to understand satan having sex with Eve, you must understand why.Satan knew that the Messiah Jesus Christ would come through the lineage of Eve. This was the first attempt by satan to destroy the pure seed line that Christ was to come through, umbilical cord to umbilical cord, four-thousand years later. The second attempt was with the fallen angels,Genesis 6:2 "That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose."Genesis 6:8 "But Noah found grace in the eyes of the Lord."Genesis 6:9 "These are THE GENERATIONS OF NOAH; Noah was a just man and perfect in his generations, and Hoah walked with God."The term, "and perfect in his generations," is referring only to his ancestry. Does it mean there was no sin in them? No; for we know sin came into this world through his ancestors, because the Bible clearly tells us of the sins of Adam and eve in Genesis 3, and Enos in Generation 4:26. Both Noah, and his wife came from families which are recorded in the scriptures, as not mixing with the fallen angels. Neither of them had a drop of angels blood in their veins.The word "generations" in the Hebrew text is # 8735 in Strong's Hebrew Dictionary, and comes from the Hebrew prime; "Toledoth", and means family tree, or history. When we take "family history called "perfect", in the Hebrew text it is called "tamin", that family is "without blemish as to breed, or pedigree".This verse does not speak of Noah's moral perfection, but tells us that he and his family had preserved their pedigree, and kept it pure, inspire of the prevailing corruption brought about by the fallen angels, [their children were called "Nephilim"].And the third time was with Herod,for after he(satan) failed in his attempt to polute the bloodline, he tried to kill Christ before He grew up.Matthew 2:13 "And when they were departed, behold, the Angel of the Lord appeareth to Joseph in a dream, saying, "Arise and take the young Child and His mother, and flee into Egypt, and be thou there until I bring thee word: for Herod will seek the young Child to destroy Him."Satan is fearful of Christ because he knows that it is Jesus Christ who will eventually accomplish casting him into the lake of fire (Hell), which will be his eternal perdition. This is prophesied, and we will cover it in [Gen 3:15]. We know that satan's plan failed with the ultimate birth of Jesus Christ who upon his crucifixion, defeated death, which is to say defeated satan. Satan is death, it is one of his many names and roles he has played and will play in the Bible.Gen 3:14-1514 And the LORD God said unto the serpent, Because thou hast done this, thou art cursed above all cattle, and above every beast of the field; upon thy belly shalt thou go*1, and dust shalt thou eat*2 all the days of thy life:Explanations from above verse: *1 upon thy belly shalt thou go = A Hebraism (figure of speech) for utter defeat as in Ps 72:9 & Isa 49:23. *2 dust shalt thou eat = A Hebraism (figure of speech) meaning an ultimate term of degradation, as in Ps 44:25.Now the next verse is where "the rubber meets the road" as far as what really happened between the serpent and Eve. This verse will also show us the first mention of the promise of the Messiah Jesus Christ. This verse also contains the first prophecy in the Bible:15 And I will put enmity*1 between thee and the woman*2, and between thy seed and her seed*3; it*4shall bruise thy head*5, and thou*6shalt bruise his heel*7. Explanations from above verse: *1 enmity = Hebrew word #342 'eybah (ay-baw'); from 340; hostility: a primitive root; to hate (as one of an opposite tribe or party); hence to be hostile. *2 between thee and the woman = Not enmity between a garden snake and a woman, that doesn't even make sense! But enmity between the offspring of the serpent (satan) and the offspring of the woman (Eve, through Adam, and thus of God). *3 between thy seed and her seed = seed: Hebrew word #2233 zera`- seed, sowing, offspring, a sowing, seed, semen virile, offspring, descendants, posterity, children. From #2232:to become pregnant, to be made pregnant. *4 it = Jesus Christ. *5 bruise thy head = Jesus destroying satan. *6 thou = Satan. *7 bruise his heel = Satan causing the crucifixion of Jesus Christ.In [Gen 3:15] above, you have in the statement: "Enmity Between thy seed and her seed" the first great prophecy of the Bible. Eve was the great great great. . . great ancestor of the Messiah Jesus Christ, by birth to birth . Jesus is the "her seed" referred to here. Satan and his offspring are the "thy seed" referred to. The serpent's progeny, his offspring, will be cast into the lake of fire after judgment day. Satan, in the role of antichrist will also be destroyed at that time, as well as all the roles that satan has played since the beginning of time, just like the burying of a copyrighted actor, all his roles go with him. In other words, from this first prophecy you have the entire plan of God. The battle between good and evil has already been won by God. All that remains is for each of us; each individual soul that has ever lived, or will ever live, must make their own choice as to whether they will follow God into the eternal Heaven, or follow satan into the eternal perishment of the lake of fire, the abyss (Hell).Those are the only two choices, there is no special place set aside for those who call themselves: Agnostics, Atheists, Heathen, Non-believers, "Mr. Or Ms. I don't have time for God," or "Mr. Or Ms. I don't give a care,". . . These are all just fancy titles and descriptions for the same lot that will accompany satan into the pit, into the abyss, the lake of fire if they don't repent and worship Almighty God and his only begotten Son Jesus Christ, before that great and final Day of Judgment. This is scripture, it is written, it is the second death, and it is the death of a soul [Rev 20:10-15]. Gen 3:1616 Unto the woman he said, I will greatly multiply thy sorrow and*1 thy conception*2; in sorrow*3 thou shalt bring forth children*4; and thy desire shall be to thy husband, and he shall rule over thee. Explanations from above verse: *1 and = Read as: "And multiply thy conception." Eve had twins. *2 conception = Hebrew word # 2032; pregnancy: from # 2029; harah to conceive, to become pregnant, to bear, to be with child, to be conceived, progenitor. * 3 sorrow = Hebrew #6089: Worry, toil. This is not talking about the physical pain of childbirth, it is mental anguish. After all, one son killed the other. And the remaining one was banished from Eve's sight forever. This brought Eve much sorrow, think like a mother to understand this word "sorrow." *4 children = Hebrew word # 1121; ben: Son. Plural, this Hebrew word is unique in that it is only used of male offspring! It was talking about Cain and Abel. Eve was now pregnant by the serpent (satan), Adam doesn't have sex with her until the next chapter. Adam and Eve were innocent in the Garden of God, knowing no evil or sin. Satan came in and took advantage of their naivety and the inherent disobedience of man. Adam will have sex with Eve [Gen 4:1] and she will bear twins from separate conceptions, but the same pregnancy (Fraternal twins). You will see that the order of birth is consistent with the order of conception, Cain is born first, then Eve continued in labor and bare Cain's brother Abel. Gen 4:1-21 And Adam knew*1 Eve his wife; and she conceived*2, and bare Cain*3, and said, I have gotten a man from the LORD*4. Explanations from above verse: *1 knew = Sexual intercourse. *2 conceived = Second conception (Abel). *3 Cain = Born first (serpents son). *4 = Read as: "I have gotten a son with the help of the Lord:" ('ish 'eth Jehovah). Eve had no idea what was going on here, she did not know that Cain was from the serpent (satan).2 And she again*1 bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground. Explanations from above verse: *1 again = Hebrew word # 3254; yacaph (yaw-saf'); a primitive root; to add or augment (often adverbial, to continue to do a thing). In other words, Eve continued in labor and had the second of twins.OK, now If Eve bore Cain and then continued in labor and bore Abel, what do you have? Twins of course. And If Adam had her once, and the serpent had her once, and God told her that her punishment would be to bear children (plural, and most specifically male) in sorrow (not the pain of delivering children), and that her children's children would always be enemies, even murder! What do you have? What's shaping up here?Cain and Abel were Fraternal Twins, born of two separate conceptions, by two different fathers. One, satan through the serpent; and one, God through Adam, and eventually 4000 years later, umbilical cord to umbilical cord would be born the Messiah Jesus Christ, whom satan would cause to be nailed to the cross (bruise His heels), crucified; but whom would eventually cast satan into the lake of fire (Hell) and eternal death (bruise his head).(The seed flourishes. This is the ancestry of Jesus Christ. Observe that Cain is not mentioned, for he is not in Adams generations [genealogy]. Nor is Abel, whom Cain slew, because he had no progeny, leaving only Seth to carry on Adams seed-line [family name])Gen 5:1-71 This is the book of the generations of Adam. In the day that God created man, in the likeness of God made he him; 2 Male and female created he them; and blessed them, and called their name Adam, in the day when they were created. 3 And Adam lived an hundred and thirty years, and begat a son in his own likeness, after his image; and called his name Seth: 4 And the days of Adam after he had begotten Seth were eight hundred years: and he begat sons and daughters:5 And all the days that Adam lived were nine hundred and thirty years: and he died.6 And Seth lived an hundred and five years, and begat Enos:7 And Seth lived after he begat Enos eight hundred and seven years, and begat sons and daughters:You notice that Cain is not mentioned in Adams Generations (Genealogy)! It goes from Adam to Seth. This is because Abel died without having any progeny (children) and thus not in the line of Christ. And Cain is not Adams son!Adam is the Great Ancestor of Jesus Christ on Mother Mary's side. You will also notice that Cain is not mentioned. The birthright went to Seth, for Cain was not of Adam.Luke 3:21-38 (Verse 24-37 omitted)21 Now when all the people were baptized, it came to pass, that Jesus also being baptized, and praying, the heaven was opened,22 And the Holy Ghost descended in a bodily shape like a dove upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased.23 And Jesus himself began to be about thirty years of age, being (as was supposed) the son of Joseph, which was the son of Heli, . . . (verse 38) Which was the son of Enos, which was the son of Seth, which was the son of Adam, which was the son of God.