To Clean or Not to Clean? That is the question.

Can anyone explain to me the decidedly female mania about cleaning the house before anyone from out of town comes to visit?
I mean, I live in it every day. It's good enough for me.
My house has a certain reputation for being 'company' presentable all the time. Actually, most entertaining happens after dark. There is a reason for that. If everything is picked up, put away & tidy, the layer of dust is not visible. It is even less visible if untouched, leaving an even surface with nothing to mar the look. I do knock the dust off the wine rack & bottles, because it's a sure bet someone is going to go there.
The bathroom is the only room I make an effort to make company presentable. I have tried lighting candles in there but someone always finds the light switch. And they close the door. So it is mandatory to clean the floor that is seen while sitting. I have been known to never see someone (guy) when the bathroom was disgusting. Let me make it clear: Mine is NEVER that bad. But for the uber fastidious, I do make an effort.
I digress. What is it that drives us (I know I am not the only one) to go nuts with the cleaning? Did our foremothers sweep out the cave when the neighboring tribe was coming to harvest berries? Were they nuts about making sure the twigs for kindling were all neatly put in the basket? Did they clean the basket first?
Deep down, I know no one cares if I cleaned off the lid of the trash can. And I still do it.
I know when I go to someone's home, it has to be pretty awful before I even notice.
Is there some psychology about our chromosomes and the perception of cleanliness?
The rest of the place is calling my name.