The twofold answer to this question can be found in the serpent's question regarding God's word, "Yea, hath God said, Ye shall not eat of every tree of the garden?"
The repercussions of this anwer profoundly preclude the possibility of life elsewhere
In God's mercy, it is one of the primary reasons death came upon all men
The correct answer to this question helps one to understand why Jesus' does not "know" the hour of his return
The success of this most basic of all heterosexual relationships can be found in each of the party's individual relationship with Christ
This gets to the very heart of the marriage relationship AND God's dominion mandate
It started in Eden, it continues today!
What was behind Satan's two-pronged attack against the truth?
Even though Eve sinned first, sin's consequences came through Adam. This resulted because of how God views the marriage--through the man. Anyway, the consequences of Adam and Eve's sins forebode the following:
It was to prevent them access to the tree of life and live forever in their fallen state
Everything Satan told Eve was a pack of lies. The first couple knew from God's commandment everything they wanted and needed was theirs, through godly obedience. God's commandments produce light and life (Rom. 7:7). The word "know" in Genesis 3:22 means by experience, the same as it means in Mark 13:32.
Simply put, marriage is THE institution upon which all society rests.
I answered this question previously. The answer is no. If Adam and Eve had a child before the fall, then this individual would not have possessed any sin. This means Adam and Eve had not consummated their marriage in the sight of God. Sexual union between a man and a woman in marriage constitutes THE act that seals marriage. Without that, marriage is not marriage from God's perspective. God is not a prude. Just read Song of Solomon! God very much approves of sex; however, it must be done in the context of God's marriage covenant.