To turn on nude, the game must be on the HDD (I used dvd2Box). 


1. Change default.xbe to default.xbe_suit THEN change default.xbe_nude to default.xbe

2. Change datadvd.afs to datadvd.afs_suit THEN change datadvd.afs_nude to datadvd.afs

3. Reboot your xbox.

3. Reverse this process to change it to the original game.

DONE. If you want, you can then use Quix to convert to an iso and burn a nude version of the game.