May i ask, is it a single or multi user machine? Who owns it and/or has root access? Will anyone try to access your account (sudo abuse, give me the password let me search, bumps into it on shared account, etc...)?
Why hide it? But unless you normally have hidden files shown you could just put a period at the start of the folder name and then it'll be hidden (works on windows too). Generally you'd put all that stuff in the home folder for your user, so "/home/<username>/.notporn/"