From adult fan fiction net
Story codes you'll need (especially with me writing):

B-M (body modification - piercing, tattooing, scarification, etc.)
VS (Vamp-sex)
BP (non-Vamp, non-menstrual blood play)
CS ("crime scene" - menstrual blood play)
Nec (necrophilia - non-Vamp)
GB (gender-bender-chara sprouts-new genitalia-possibly anime-specific.) If you need an example, see my story "The Gift.")
TG (transgender)
CD (cross dress)
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Additional Codes

Anal -- Anal sex
Tentacle -- Sex with monsters with tentacles (Common in anime porn but
also found in others)
Fet -- Various fetishes
MC -- Mind Control
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Subject: Re: (additional Codes)

Damn I forgot the tentacles...