Seeing as I don't need "stealth" I'm going to offer a convenience choice instead.
A USB stick. Handy things. I recommend the Sandisk Micro Cruzer I have the 2gig version, but likely would rather have a 4, maybe someday an 8 when price is more friendly.
Sandisk Micro Cruzers have many neat features. One is built in porn browsing security if you are interested (one of many free downloads).
You can load up a file encrypter like Kruptos 2 on it if you must.
I run my FireFox 3 directly off of it although I had to manually install it as U3 hasn't migrated from Firefox 2 yet.
And of course all your porn is on the USB not the computer. Not a security thing, just a case of it can go where you go.
Hey if you're going to be out of home for say a week, you might appreciate that
Those of you guys that have need of stealth though you have my sympathies