In the age where you don't need a publisher, distributer or any of that to put out a game, you don't really have to worry about rating. Any game/movie can tell a good story and throw and graphic sex/death scene in and get it jumped up to M or even AO but honestly that's not the point that should be gotten at.
Thinking of it is kinda a tricky subject... Fact and point anything can be made into a game, a so called good game that people will play ie cookie clicker/cow clicker. But to create an AO game that center story is it's AO writing and have a good deep story is kinda like writing a game about someone that rapes and tortures everyone instead of just killing everyone, hard to make them into good story elements.
Thinking of it is kinda a tricky subject... Fact and point anything can be made into a game, a so called good game that people will play ie cookie clicker/cow clicker. But to create an AO game that center story is it's AO writing and have a good deep story is kinda like writing a game about someone that rapes and tortures everyone instead of just killing everyone, hard to make them into good story elements.