Mysophilia is a paraphilia where erotic pleasure is derived from filth.^[1] Mysophiles may find dirt, soiled underwear, feces, unwashed people, or vomit to be sexually arousing.^[2]

People with mysophilia have been known to be aroused by unclean locations, such as an alleyway or a dirty bathroom, and behaviors, such as not bathing for many days at a time.^{[citation needed]}

The protagonist of the novel Wetlands, and the film based on the book, would be considered a mysophiliac, deriving pleasure from not washing and from dirty locations, such as toilets.

Napoleon Bonaparte, while campaigning in 1796, wrote to his wife Joséphine: "Please don't wash, will arrive in three days".^[3] This can be interpreted as mysophiliac behaviour if it is assumed this was to ensure her clothes, as well as her person, were soiled.

Arthur Munby, 19th-century English writer, and his wife Hannah Cullwick, a maidservant, both wrote extensively in diaries about the dirt accumulated in household tasks. During courtship, Munby frequently requested Cullwick visited him still dirty from her work sweeping chimneys and cleaning boots.^[4]

• Mud wrestling
• Salirophilia
• Wet and messy fetishism