What single player games need PORN

Think of a single player game that could integrate sex and nudity into existing gameplay.  Or at least copy the gameplay of an existing game.  For example:

MGS- You are a female sniper who must infiltrate a base, sneak around, and avoid getting RAPED.  Bonus endings unlocked for number of times raped.

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I know, and that is what makes me sad.  I want the US to become the world capital of animated porn, but subversive elements have prevented it thus far.