Spirit beings do not procreate that's why God made man. So you are correct angels never have and were never able to have sex. In the first place you need to be of the same kind to reproduce. A dog and a cat cannot reproduce. That's why in Genesis 1 it says everything after its own Kind.
Luke 20: 34 - 36
34 And Jesus answering said unto them, The children of this world marry, and are given in marriage:
35 But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage:
36 Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
What people also don't understand is that there are three sets of sons of God. The sons of God in Genesis were talking about man not angels.
Romans 8: 1, 14
1 There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.
14 For as many as are led by the Spirit of God, they are the sons of God.
Luke 3: 21 - 24, 37 - 38
Verse 38
Which was the son of Enos, which was the son of Seth, which was the son of Adam, which was the son of God.
Most of the scripture runs down the lineage of Seth who everyone forgot about but everyone knows the famous Cain and Abel. You can read on your own this proves that humans are the sons of God not just angels and this is exactly why Satan hates us. He wants to kill us because of jealously just like how Cain slew Abel. Satan does not want us to become God.
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Read my post above. Also I don't see the word nephilims in the scriptures you just showed to me.
Alright, well I learned something.