Q. Are there any subjects which are not allowed to be discussed, images not to post?
A. Yes. Do not post anything racist in nature, the same applies to religious matters. Hate speech of any kind is forbidden. Do not post, link or make available anything obscene, indecent, violent, gory, or illegal. Do not use insulting or denigrating personal attacks against other members, nor make inflammatory posts obviously intended to start a fight, get a reaction, or cause problems (flaming).
One member has just been banned for linking to a gory castration image, which, for those that had the misfortune to view it, might haunt them for some time.
These kind of images are disgusting, and unwanted on this site, or any others, unless you are in need of serious psychiatric help.