Porn games obviously. They're all incredibly formulaic. They have no identity, all look the same, and are ugly even from an aesthetic standpoint. So why are they so popular?
Take "games" off and ask the same question. You get the same answer. It doesnt matter all that much if it is the same because most people consuming this content are in it for the tits, not the plot. And even those like me that are in it for the plot are not expecting half a billion worth of Hollywood talent in it.