" # Sex is Sacred. Yes. Human sexual union is sacred, because sex is where life comes from. That means, in cooperation with God. God is the Primary Cause, the parent's sexual union is the Secondary Cause."
The parent's sexual union is the primary cause. There need not be any cooperation with God at all, nor does God cause the sexual union. That image of God is complete and just as God can create life, so too can man.
"I think you missed the part about the Holy Spirit being the "Lord and Giver of Life.""
I did not. The life referred to is eternal life.
"in the case of the human soul, each one DIRECTLY and INDIVIDUALLY created"
What is a soul exactly?
Did not He who made me in the womb make them? Did not the same One form us both within our mothers? (Job 31:15)
For You created my inmost being; You knit me together in my mothers womb. (Psalm 139:13)
It makes no sense in the light of this to say the Holy Spirit is only the Lord and Giver of "spiritual" life. He is the Lord and Giver of personal life, and a person (human being) is a composite creature both spiritual and physical: God gives personal life, which comprises both.
Humans participate in this via sexual intercourse. God does not force us to engage in sexual intercourse, nor does intercourse always result in conception. Very often it does not. But when it does, and life is transmitted to a new generation, we are cooperators with the Lord and Giver of Life.
You: "There need not be any cooperation with God at all."
I am perplexed by your response. I have never met anyone (except for an atheist) who says God is not the giver of life.