What Does M/F Mean?
AO3 PlatformAO3's relationship category for works focused on a romantic or sexual pairing between a male and a female character. Fans also call these pairings 'het,' short for heterosexual.
M/F in Practice
On AO3 the category technically appears as F/M, though fans write it both ways in casual conversation. Like all archive categories it signals the work's primary focus rather than an exhaustive list of relationships, and authors choose it themselves when posting. Some longtime fans distinguish between 'het fandom' and 'slash fandom' as cultural spaces with their own histories, conventions, and classic pairings, though on modern AO3 most readers move freely between categories.
Example usage
"She mostly reads M/F in this fandom, so I recced her the big canon-divergence het epic."
Related Terms
Het
Fanworks centered on a male/female romantic or sexual pairing — the M/F category in AO3's taxonomy. One of fandom's oldest classification terms, short for heterosexual.
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M/M
One of AO3's relationship categories, indicating a work centers on a romantic or sexual relationship between two male characters. It appears as a colored square icon on every work listing.
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Multi (AO3 Category)
An AO3 relationship category for works featuring multiple relationship types or a relationship involving more than two people. It covers everything from love triangles to polyamorous ships.
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Pairing
The romantic or sexual relationship a fic centers on, named by its two (or more) characters. 'Pairing' is the slightly more formal sibling of 'ship.'
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