Are our minds souls? Re the rational intuitions that represent procreation to be ethical - well, those, I think, have been induced not by drugs, but by environmental programming. That is, most humans are going to get the intuition that procreation is ethical regardless of whether it actually is or not. Thus that intuition doesn't count for anything, I think.
Re thinking that only your own rational intuitions have any probative force - no, here we simply disagree. I think it is arbitrary to think that your rational intuitions count for something and those of other people do not.
I am not denying that sometimes one may be perfectly justified in believing something on the basis of one's own intuitions, even when they are contradicted by others. And I don't deny that we're often justified in giving our own intuitions some default clout that we don't have to give to others (but in all these cases I would support my case by pointing out that this is what other people's intuitions say too). But to think that, systematically, one's own count for more just in virtue of being one's own is, I think, prejudiced. I can see no reason to think it would be true - you'd have to think that you alone are hooked up to rational reality, that you have some special insight that others lack or something. And those just seem like prejudices. I don't deny they exist - far from it, we have abundant evidence of their existence here on these threads.
I don't think that I would be giving other people's intuitions clout on an arbitrary basis, for it would be the same basis upon which I give my own clout. How's that arbitrary?
Yes, but a claim is not evidence. Our reason represents minds to be indivisible. That's why it makes no sense to attribute half a mind to someone. That's why I can't reduce my debts by lopping bits off myself. And so on. So, my premise has support from our rational representations. By contrast, when you deny it all you offer as 'evidence' is that certain theories would permit it. Well yes, but that's not evidence. Far from it - it means you're rejecting my premise not on the basis of reason, but because it conflicts with your favourite theory. Your theory is now unfalsifiable.