Mysophilia
From wipipedia.org

Mysophilia relates to soiled or dirty material or people.
Mysophiliacs may find dirt, soiled underwear, faeces or vomit to be sexually arousing.
It is possible (although not required) for persons with mysophilia to be aroused by unclean locales, such as an alleyway, or a dirty room/bathroom; wearing the same clothing for many days at a time; or not bathing, from mere days to several weeks.
See also
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