Yet, there was something else. When the "children of God" came to have sexual intercourse with women of the Earth breeding, the result of that unnatural experience was giants on the Earth (as told by all legends in the world). 2 Peter 2:4-10 and Judas 6, 7 were based upon Appocrypha manuscripts. Genesis 6:1-5.
We don't have to confuse this event with dwarfs and giants in Cain's offspring as told by Jewish myths hidding some secrets. Specially the possible poliploid black hermafrodits with 6 fingers (2 Samuel 21:18-22).
But even before that , Samael, the Oposser was the first Satan to mingle his seed with Eve. That is Jewish legend.
When Genesis 4:1 says Eve had a child with the help of the Lord and man had sex with her, we always thought this Lord was Almighty, but was He really? The revelation of the name was to Moses in Exodus 3:14 in the bush tree episode. Even so, the Jewish account remembers that was not "god" himself but a "powerful" entity acting like an ambassador using his name (Acts 7:30, 35, 38). I have my reasons to believe that entity was arcangel Mikael (Michael) but that's another theme.
In Hebrew, everytime we read the translation "know" is yadha meaning knowing by experience. Therefore Genesis 4:1, 17, 25 indicates there was SEX in all this events. It wasn't a case of "glad to meet you AGAIN, darling Eve" in Genesis 4:25. Everytime a child was conceived and a woman becomes pregnant. The pain of the pregnancy is related to the sin and sex, of course. The euphemistic "hips" was a reference to sexual organs. The original couple didn't think the "nudity" was neither in the mouth eating the fruit or the hands stealing it but those "hips" that eventually were covered by fig leaves (3:7,8) and after the god-entity provided them larger skin clothes (3:21). Just to cover their parts or to protect them to the new conditions in the Earthy paradise. So, if Samael didn't lie regarding the knowledge of the "opening of the eye" cos this god confirmed it, what was the sin? It was sex with Eve, that's why she was cursed and the eternal doom between the seed of a woman and Satan, the blessed one and the cursed one. Genesis 3:14, 15. Yet there's a trick here.