"Zou Ma Qiao" has 16 tips for identifying unmarried people, one of which is: Those who have an abnormally clean house will be single. Sexual intercourse between men and women is an obscene and filthy matter, and anyone with a mysophobia will be considered evil. The house in which a person with a mysophobia lives must be extremely clean. ——This article may not be very useful today, but you might as well be aware of it.