The "Biblical" term for sexual intimacy is "knew". As in "Adam knew Eve and she conceived".

While much can be stipulated, the text in no way implies that Eve "knew" the serpent or that the serpent "knew" Eve in the Biblical sense.

Cain and Abel were the offspring of Adam and Eve.

It says that black and white in the Bible.

And no, the serpent did not have relations with Eve.

You don't get to choose who answers the questions, this is an open forum.

All holy-books without exception were written by superstitious people..and superstition has no rules..so they make up any wild story they like and claim it was divinely inspired.

To appreciate its significance, consider the various elements of the prophecy itself. The one addressed at Genesis 3:15 is the Serpent—not the lowly snake but the one who used it. (Revelation 12:9) “The woman” is not Eve but Jehovah’s heavenly organization, the mother of his spirit-anointed servants on earth. (Galatians 4:26) The Serpent’s “seed,” is Satan’s seed, his offspring—demons and humans as well as human organizations that manifest the traits of Satan and that show enmity toward the “seed” of the woman. (John 15:19; 17:15) The woman’s “seed” is primarily Jesus Christ, who was anointed with holy spirit in 29 C.E. The 144,000, who are “born again . . . from water and spirit” and who are heirs of the heavenly Kingdom with Christ, are a subsidiary part of that seed of promise. These began to be added to the woman’s seed from Pentecost 33 C.E. onward.—John 3:3, 5; Galatians 3:16, 29.

Of course the Adam and Eve story is fiction.

So what ever theory there is concerning it, it has to be false.