Dude, there is no such thing as "angels mating with humans". That is not what nephilim means. And they are not aliens either. They are exactly as it says, men of reknown. The earliest Rockefellers. They simply took women.
I hear this assertion from many so called "experts" on the bible though that angels mated with humans. If that is true when and why did they ever stop? You'd think they would be flying down next week. (angels do not fly and do not have wings by the way)
Angel are not given the ability to procreate. They are not gendered. Only humans can procreate. Angels are created beings of God.
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1PS