No blood, no scat, no any form of abuse. I cannot rule out bestiality. I have never done it and it is not in my plans, but in the proper conditions I do not see a moral issue and I may feel curiosity some day in the future. I love animals but so far it has been platonic.
Given those limits, I am open to try anything with one general condition: I do not enjoy being in the submissive/receiving side. I am not going to be the one receiving the massage, or being tied, or anything else.