The reason women (married or not, working or not) do the majority of the housework is because of one simple thing - women's standards for tidiness are multiple times higher than men's. We are OK with an upturned shoe in the middle of the hall. You decree it a "filthy mess" and declare war on it. We men will clean the house to the point it is sanitary. You can clean it to the point of perfection if you want. We guys have more important stuff to do in life.