"I hoover after we have eaten for fear of crumbs! - that is not natural"
in the olden days (i.e. when ab first started) we lived in caves and stuff and to drop stuff on the floor just simjpley happened because it fell through our fingers, what with their being a lack of cutlery and swiss army knives. if that attracted ants and lice and other brtal paraistes, like mice etc, then so be it. we lived with them and let them in. sometimes we even let them into our hair - or tummies after 10minutes on the fire.
these days we live indoors. we don;t want mice ants or rats to come in because of the crumbs on the floor, or to live with us in happy harmony. damit, we don;t even tend to eat them that much these days. so clearing away the crumbs is quite natural now and if we use the most modern and easiest means necessary to do this - as would mrs neanderthal (who presumably got a nice new fox tail brush from mr neanderthal for xmas).
in terms of appearance and smell, if we were to revert to nature and reinvent ourselves as nature intended, then you might as well stand at the back of a donkey lifting its tail and stairing into its starfish waiting for it to break wind. you'd not be far off.