The ET races of the Templar Melchizedeks (Sirian Pleiadean Anunnaki) and the Leviathan Drakonians were sealed from interbreeding again with the human evolution long ago after the 3rd seeding of the Angelic Human.
While it is physically possible for those ET human hybrids to have sex with humans, there were seals placed around the DNA of Templar Anunnaki and all Drakonians here which would reject the embryo from Angelic Humans, this is why only certain bloodlines can propagate here, and one of the reasons why the royal bloodlines interbreed with themselves.
If they want any offspring at all, they have to go to those carrying the IR (invader race) genes of their own species or with other illegal aliens here. The first seal called the Templar Seal was placed on their DNA 10,000 years ago, and then again, another additional seal was placed on all beings carrying the Templar Seal bloodlines 3500 years ago called the Templara Axion Seal, (having to do with the Axiatonal codes of their DNA, since the Templar Seal was not blocking ascension to dimension 4 of Tara the Humans who had started interbreeding with their captors once again) a second block that locked ALL beings who carried the ET genes from ascending where they had done so much damage in 1500 BC in a raid on Tara.
The Templar Axion Seal is now known in religious terms as the “Mark of the Beast”, or in simpler terms, the “Mark of the Invader Races”.
It sealed the 6th base tone of the 1st DNA strand, the 6th base tone of the 5th DNA strand and the 6th base tone of the 6th DNA strand, now referred to as the “666”.
~ Decoder @EmeraldLawofOne