"just haven't?" so did you just get sick of it? or did you run out of diapers? or did a gigantic pterodactyle swoop down out of the clouds and rip the diaper right out of your pants and fly off, cackling evilly down at you?
like mesmerale says, this thread doesn't make any sense until you provide people with more information. if you just got sick of it after a while, though, i'd suggest that it's a waste of diapers to wear them when you don't want to.