I don't know,
Cleaning house stresses me,
Watching the dust bunnies play in the candlelight while not having to wash dishes is very relaxing to me.
So is using the iron as a doorstop, having enough underwear to only do laundry once a month and using the pets as organic floor cleaners.
I go for a mammogram once a year.....
that is about as often as I clean house....
It's worth it :)