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I'm wondering if, by "clean," the guys mean someone who's clean around the house. A lot of middle-aged men are hoping that they can find a woman who, in addition to providing regular sex, will pick up after them should they end up marrying or cohabitating. Even if guys are willing to take care of their own messes, hardly any want to be the male equivalent of a housewife and clean for themselves and their partners. And I think many people of both sexes see a messy home and conclude that the occupant is hygienically unclean as well. Just a thought.