Yes that is true, I reread the passage, however angels cannot procreate and are not sexual, end of story.
Nowhere in the Genesis 6 Verses does it mention anyone having sex. It says women BORE children. That's a process that doesn't include sex at all.
The entire problem with your viewpoints are you think these things had sex with human women.
Here's a quick question for you:
Why does the Bible specify the women are HUMAN but the men are not?
It plainly says the Women are Human. Why do we need to know the women are human if the men are also human.
The fact the Bible tells us the men and women are different species should tell you if the Bible says women are human but says men are something else. It means, the men ARE NOT HUMAN.