Don'ts

Don’ts:
Guro
Violent abuse (like ballbusting)
Scat
Furry
Futa on male
Shemale (no pussy)
Obese fat
Vanilla stuff between two or more characters (male on female, cute softcore yuri, or stuff that's just too "normal" [not counting futanari])

"Soft"-Don’ts :
(often declined by me but you can still ask about them anyway, just in case I make an exception)
Human males
Anal
Original characters (this is such a wildcard...)
Clearly Western cartoon/comic characters (ditto, but I generally hold game characters in somewhat higher regard)