| Code | Meaning |
|---|---|
| ag | ass growth |
| ama | amazons (includes She-Hulks) |
| an | transformation into an animal (distinct from 'furry') |
| ap | age progression |
| ar | age regression |
| au | authors appearing as characters |
| bd | bondage & discipline |
| be | breast expansion |
| best | bestiality |
| cel | celebrity |
| fan | fanfic (fandom fiction) |
| fat | fattening / feeding |
| fd | female domination |
| ff | lesbianism |
| fur | furry / anthropomorphic |
| gts | giantess (either growing woman or shrinking man) |
| inf | inflation |
| lac | lactation |
| mask | masking |
| mc | mind control |
| meta | meta-fiction (usually authors appearing as characters) |
| pe | penis enlargement |
| pr | pregnancy |
| robot | robotization |
| shem | shemales |
| shr | shrinking woman |
| sla | slavery |
| slut | enforced sluttiness |
| sm | sadism & masochism |
| tg | transgender |
| trans | generalized transformations |
| ts | time-stop |