Apple does not permit any sexually explicit content in the App Store.
There are sex games for i OS, but they aren't really apps; they are actually Web apps running through a customized browser.
You control the "spice" of the erotic actions, from harmless fun to wild, anything-goes kink.
You choose "roles," which tell the game what kinds of actions you prefer to be involved in.
This serial number also lets you use the Card Editor program to edit your own actions.
When you register Onyx, you will receive a serial number in a separate email.
Onyx contains explicit descriptions of sexual acts.