If these verses tell us anything, they speak of the innocence of sex in Eden. The Lord was the initiator of marriage by creating the woman and bringing her to the man. Clearly there is a sexual element to his response. The energy of sexual attraction brings about an oneness that is profound. Everything is altered by the choice of this relationship initiated and brought about by God.
Marriage is a uniting of two people at every level.
The choice to marry means a commitment to one whole person for one whole lifetime. The Pentateuch provides us with information concerning sexual sins, and the various forms of punishment required by each. God has always view sexed outside of marriage as sin. The life of Joseph reveals this truth. There is no one greater in this house than I, and he has withheld nothing from me except you, because you are his wife.