If you need to get your fix on AppStore apps that aren't appropriate in places like work Apple has heard you and is now allowing these types of apps into the AppStore. Don't get too excited though because these aren't going to be pornographic in nature; just crude and lewd.
Need an example? Farting. The app Pull My Finger was originally rejected from the AppStore some months back and how now been let in to the AppStore. IF fart jokes are your thing then lucky you -- you can also grab iFart which does the same thing as Pull My Finger.
Gizmodo is reporting that apps like Pull My Finger and iFart Mobile are going to be in a new AppStore category specifically for NSFW apps. The AppStore doesn't have this new category yet and the apps are currently being categorized sort of randomly with Pull My Finger considered "Entertainment" and iFart Mobile as a "Game" even though they do the same basic thing.