This just recently appeared in the news:

NYC police officer charged in cannibalism plot

Make note of how they got evidence. I know that we have enough sanity to not do anything like this, but it does mean that we've likely been watched for a long time, and if the situation becomes political, we could be in trouble anyway. Remember that the kiddie porn law explicitly does not make a distinction between reality and fiction; a similar law concerning our fetish could always be crafted.