I don't know about choking on the dick but I don't think it is very possible because you will not hold it inside for that long

as for cutting, I suppose the wound will hurt far more than anything inside and there is also an issue of human physiology where you cannot really identify the location of pain accurately pain usually goes along with the sensation of touch so if someone will hurt your insides you will feel pain somewhere on your skin.

however, if you watch what is going on your guts your brain will most likely reassign all sensations to the right places If you don't see it you will have hard time to tell where it hurts

as about the smell, it is funny that smel of our own shit is actually somewhat pleasant incomparison to other people and the content of out intestines is not yet rotten and does not stink that much, as shit. since it is pretty clean chewed food while smell and brown color only comes from the bile liquid.

I don't really know how sensitive intestines are to touch they may feel nothing or they may hurt like hell just from getting touched with something rough I woud suspect that they shoud not fell anyhting