There is no game on consoles that have the Ao rating. On PC you may find a few, but they\'re on games which are pretty much hardcore pornography. Stuff you\'d have to buy from the retailer themselves or pick up in an adult bookstore. Since they\'re porn, most all of them are pretty shytty quality since they\'re only real selling point is the ability to jerk off to them rather than gameplay. It\'s rare that you find an adult game which actually has both good gameplay and strong mature themes. True Love and Metal & Lace 2 are both good examples, but they were produced before the rating system was put in place afaik.
Even softcore pornography like Leisure Suit Larry only recieves a mild M rating.
