Having a fetish is just human nature, it depends on which one's you have and how open with them you are that gives the image.
Anal, basic and simple fetish, don't be afraid to talk to your partner about it and see how open to it they are, not to be made public.
Masochism, more nuanced and has a few flavors, talk to your partner about it and see where you both stand on the topic, not everyone is comfortable with inflicting pain during fun times, not to be made public.
Scat, now we are getting into the controversial stuff, you want to be careful since the nature of this fetish can lead to severe health problems if you have open wounds or get anything in your eyes or mouth, not to be made public.
Hematolagnia, the fetish for blood, can be hard to bring up, cant easily acquire blood thru safe or non painful methods, be careful who you bring it up with.
bestiality, probably best to only bring it up with trained professionals, illegal in most places since it can be harmful to one or both parties, do not make public.
Necrophilia, the fetish of dead bodies, Illegal in most of the world, best to talk to trained professionals soon, do not make public.