the_lhc:
ashworth_rich:ok.
So most of taste is smell, right (hence why you taste less with a cold).
Well, for a while they've been able to smell with synthetic noses (things like plastic explosives at airports and they even hunt for truffles with them). This proves that all things smell the same in reality.
So really we are all tasting the same thing.
I don't think that goes at all, all that proves is that molecular samplers (which is what the sniffers are actually) register molecules in the same way, which isn't that surprising as the devices are probably all made by the same company. That certainly doesn't mean that humans all react in the same way to any given molecule that enters the nose. I mean personally speaking I know that I can barely smell, errr, human effluence, at all; we had to open up one of our drains a few years back because it was blocked, everyone else recoiled in horror, I never even noticed anything, and yet in general I have an excellent sense of smell, just not where that particular smell is concerned.
We can't even be sure that everyone's olfactory organs can detect the same molecules, let alone work out whether the brain interprets the signals coming from that organ in the same way.
The human nose has receptors which are activated when a corresponding molecule plugs into it. After a short period of time, once these receptors are fully populated the net result is you can't smell the smell.
I gave up smoking for a bit and I was surprised just how smelly smokers are. When I was smoking, I can't smell the smoke on me at all.
So, if you are unable to smell faeces, I can only assume.....