Comforter
If you throw a half eaten sandwich behind the sofa,after a while it starts to go mouldy and then a strange smell starts to eminate from that location,now a person with very very low intelligence would learn from that experience not to do it again,i think they call it common sense.
Also if you never wash you also begin to give off a unpleasant smell.
Are you really trying to say that you had to learn this from a book!!!
My kids will know betterHow did you manage to have children?