Bioethics would say:
1. Voluntary only.
2. Not condition of employment, marriage, contract or gain.
3. Functional to range of normal human capacities, i.e., disability.
4. Equitable application, availability.
5. Super human capacity must be external and removable.
6. Not injurious to other human capacities (intellect, affect, physicality, emotional, reproductive).
7. Safe.
Deacon Gerry Palermo