To say that the spiritual condition of the animals and the angels aren't the same means that angels have sex. Genesis 6:4 And we are like the angels. Do I think fallen angels created the Nephilim in the Old Testament? Yes. Do I think it was wrong, yes it was of a different spirit. This is where sin comes in because there is no unity in something of a different spirit. When a man comes together with a woman they are one spirit. Now I'm not a polygamist I am a monogamist I just think we become like the beasts again. Although we are very smart with our new bodies. The tree of knowledge of good and evil effects will be taken away with our new bodies. All beasts of the same kind are of the same spirit but people have individual spirits. We can partake in our spirits other people's spirits but not sexually in other speices which have a different spirit or with someone of the same sex. I saw my male dog humping my male cat. I asked the Lord and he said he was just trying to get dominance. So things aren't always how we think. He said he was innocent. Marriage between man and woman is a covenant that is beautiful and meant for earth. Animals aren't fallen yet they die. Do they sin? No. It is a mystery not a contradiction. The tree frog has multiple partners at the same time and certain birds kill the eggs of another female of the same species. Yet are they fallen? Some animals have several eggs that are desiminated by several partners and are they in sin for multiplying with several partners? Are they fallen? No. The Fruit of the Spirit can not create the fruit of the flesh. It is up to God to judge. So it is with sex. The carnal flesh does not produce righteousness. For none are righteous no not one. That of non carnal flesh creates of pure variety in that it lives by the spirit. Man in the spirit of God overtakes the flesh. God wrestles against evil. God lives only for the good. Man should not have orgies or kill one another. We should cleave to our wives and husbands loving them as they are designed by God. Some things are things of earth, somethings are things of heaven. Know what is for earth and think about heaven. The soul ties of marriage are desolved so that way we become fully one flesh with Jesus Christ. If God decides to allow covenants of marriage in heaven then glory to God. If not glory to God.
A wife in heaven is different than on earth. We are married to God and God is married to the church. Whatever the answer is to this mystery in Ephesians 5 that we are compared to in relationship know that God will satisfy all your needs. The joy and the comparsion of pleasure is like no other in heaven. It will be so satisfying what can we do without it. I can't wait for the ecstasy of the heavenly realm when our joy is complete. Oh what pleasure the kingdom will be!!