Whatever the case, I find it an amazing thing when two people are genuinely "compatible".
We've all seen such couples before, and perhaps, if you are lucky enough, you are in such a relationship.
If even it seems that the "magic" of love is degraded or lost when chemical reactions seem to be the cause of love, I think it's a unique and very "magical" thing - in its own sense - that two people are able to find someone who seems to mesh so very perfectly with them.