Could “strange flesh” refer to what began in Genesis 6 that resulted in the matting of fallen angels and humans???
Well, I think the Genesis 6 account, absolutely was fallen angels, going after strange flesh. (Human females) I could be wrong, but I tend to think the females didn’t go around saying, oh goody, today I get to have sex with a fallen angel. I think the “sons of God,” were able to shape shift, and appear as men, maybe even appear as their husbands.
As far as Sodom and Gomorrah, I think it was just homosexuality. They didn’t appear to know, the two visitors were angels, thinking they were just men. As I said, I am not dogmatic on any of this. Everyone should do their own research, and come to their own conclusions.
By the way, some real good people to watch on the “sons of God,” thing, are Chuck Missler, LA Marzuli, Tom Horn, Gary Stearman (of Stearman aircraft fame) Tim Alberino, Trey Smith, John MacArthur, Hal Lindsey, Chuck Smith, Allen Nolan, and others. Allen Nolan is very good, as is Tim Alberino and Chuck Missler.
[Strange] flesh because it is “different” from the God-ordained plan for sexuality.
https://www.gotquestions.org/strange-flesh.html