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I have a better way...

2: Put all your important documents on a small flash drive and put it in a safe! Simple!!!

This is the way to go, also you could bury your porn folder in system/library folders where most people don't look. worked on windows but sadly spotlight might find it in OSX:mad:
 
Onto page 3 and nobody has mentioned the root user's home folder at /var/root?

You need at least an admin password to even look inside. (And if you try to use Finder's Go To Folder, it won't prompt you for a password, you need to use "sudo ls")
 
I have to put in another vote for TrueCrypt. It has one thing most of the other methods don't: plausible deniability.

Basically, you create a hidden, encrypted volume within another encrypted volume. Password#1 will take you to a basic encrypted volume where you would put normal, innocent files, such as images of armchairs. Super-Secret password#2 is what gets you to the good stuff.

The great thing about this is that if you are ever uhh.."requested" to show the contents of the encrypted volume, no problem. Type away password#1, and show it off. Hidden volume #2 will never even show up until you enter your Super Secret Password.
 
Hiding porn… Mine is stored on an encrypted external volume using RSA 2048-bit encryption with an Aladdin eToken OTP. So to access it, you need the eToken, the one-time-passphrase, and the passcode to unlock.
 
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