Registration is required to see the NSFW area, but aside that doesn't do anything important or fancy. It's just to avoid to have NSFW stuff in the open.
The requirements for registration are pretty lax, just a basic username, password and a check, and you're ready to go.
Right now i have to implement a mail server, so no account recovery feature yet, but for the "amazing" features registration unlocks, you can just keep creating new users for the time being. Happy perversion!
Password must contain at least 8 characters, including uppercase, lowercase, numbers and symbols.