Of course not. Some things are spirit taught. You figure this out and you'll know where I got my info.
We know many times in the Bible where angels disguised as MEN are on earth..It would appear that this ability could also produce children. No where in the Bible does it say they cannot..... The Bible does say that there will be no marriage as there will be no need of Pro-Creation (everlasting Life)
It does not speculate to anything else that I know of. SOOOOOoooooo, if you find one, let me know......