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As suggested in the question, my understanding is that, in the opinion of early Hebrew interpreters, as well as the purported authors of apocryphal and pseudepigraphal writings, the "sons of God" spoken of in Genesis 6:2 were fallen angels. While angels are spiritual beings (Hebrews 1:14), they can appear in human, physical form (Mark 16:5). (For example, the men of Sodom and Gomorrah wanted to have sex with the two angels who were with Lot (Genesis 19:1-5).) It thus appears plausible that angels can replicate human sexuality and possibly even reproduction. I would say that there is no record of this happening anywhere else in Scripture because God imprisoned the fallen angels who committed this sin, so that other fallen angels would not do the same (as described in Jude 6).
In the NT the term “sons of God” refer to the following: (a) Jesus (Matt 8:29; Mark 1:1; Luke 8:28; John 1:34) (b) Believers (Rom 8:14; 9:26; Gal 3:26) (c) Glorified believers (Matt 22:30; Mark 12:25) or “equal to” angels (Luke 20:36). In Matthew 5:9 Jesus tells: “Blessed are the peacemakers, for they shall be called sons of God.” (also see Matt 5:44, 45). In the Gospel of Luke, the genealogy of Jesus is traced back to Adam. Luke says this: “the son of Enos, which was the son of Seth, which was the son of Adam, which was the son of God” (Luke 3:38). The difference between Seth and Adam is that Adam was created by God and Seth was born of Eve. Adam was the son of God, created to have dominion over the Earth. Thus, one definition for sons of God is those beings God Himself created to have dominion over the worlds He made. In Genesis 4 and 5 humans are divided into two main groups: the descendants of Cain (Gen 4: 17-24) and those of Seth (Gen 4:25, 26). In Genesis 6:1,2 they are divided by those who followed the Lord as "sons of God" and to the rest of humanity. In the OT “sons of God” refers to: (a) Israelite King (1 Chron 22:9, 10; Ps 2:7; 89:20, 26, 27Ps 2:7; 2 Sam 7:14). The Israelites are also called sons/children of God - Israel is the firstborn son of God (Ex. 4:22, 23). (b) a class of heavenly beings, distinct from angels, who appear to live far from the throne of God, but who visit on a regular basis for worship and heavenly meetings (Job 1:6; 2:1).
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