pita got it mostly right, according to the wuss who originally came up with it.
Actually, the wuss who came up with it is correct. Think about it. I'm not sure how old you are, but think about your room as a teenager. I bet there were dirty socks scattered all over the floor. Maybe a washcloth tucked between the mattresses for... well, you know, that may never have gotten washed in all it's life. Magazines and books haphazardly strewn across your desk. Then in comes Mom. She picks up the things that are less disgusting to touch and makes your bed.
Your first live in girlfriend demands that you use a knife and fork. Your first wife demands that you sleep on clean sheets. The list goes on.
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Mediocrity at its most average.