In Ra's description, no. He expected Raves to be infertile themselves, which means they depend on being born to human parents, generation after generation. That is also one reason he said humans will always outnumber them. He presented this as part of his picture of the Rave, and he admitted that much of that picture is speculation. So: his cosmology, not a fact, not a medical statement of any kind, and nobody knows exactly how it will unfold.
This is not a fact, not medical advice and not a promise of healing. It is part of the cosmology Ra Uru Hu, who founded Human Design, left behind, and nobody knows exactly how it will unfold.
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