it depends on which type
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You could try Crunchy roll, anime freak, and gogo anime.
I do not not exactly by what you mean by dirty anime, but I will try my best in answering your question. For really eechi and percerted anime, try this: Kanokon, KissxSis, School Days. For really messed up Anime, try: School Days (really messed up), Wlecome to the N.H.K. (Not that messed up). For a really gory, sad but romantic anime, try: Elfen Lied
Try to go to different anime boards and asking people based on the description of the anime. Or you can also google specific names of the characters that popped up in the anime.
Grow your hair out and bleach it white. Get contacts with yellow lenses and slit pupils. Buy a red hakama and haori. Wear fake fangs.
Try 2 b better about it and not be so bad I guess unless u like 2 b bad