Generally speaking, I don't recommend people worry about fantasy. The mind is a weird thing and sometimes there's some odd connections made up there that need to be worked out. Fantasy is a safe way to explore our darker side.

But I do agree with Saluki that the danger here is that you'd act out on these fantasies. Bestiality, violence, these things cannot leave your imagination for obvious reasons.

The other thing that concerns me is that all of this could be a symptom of another problem.

See a therapist and be honest with him or her about what you're thinking and feeling. This is the surest way to find a healthy way to be you.

Cyran0