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Synonyms: Established relationship
See also: ATTHS, First Kiss, UST
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RST stands for resolved sexual tension. In The X-Files fandom, the term RST was mostly used in a joking way, unlike UST (unresolved sexual tension) which was considered a legitimate fic genre.

Nowadays it has become a legitimate genre as well as Archive Of Our Own currently lists almost 3000 works from various fandoms tagged with this term.