Personal Option:
1) No need for pornograpy to be on a Bitcoin forum.
Nudity =/= Porn. I don't understand why people always make this connection. People shower nude is that pornographic? People are born nude, is that pornographic?
Wut. If you made a video of you naked in the shower, is that pornographic? If someone recorded you being born, is that pornographic? No, but its still not something your employer would want you to be passively exposed to.
tldr, naked people have nothing to do with bitcoin or bitcointalk.org, bosses don't like naked people.