After a while playing many, many games, watching and reading many stories, your mind wanders what else there is. And then you stumble upon an entire genre of games dedicated to elements considered immensely forbidden by society while presenting, sometimes, great writing or incredibly fun gameplay without the moral shackles that every game has.
Why can't you play Stronghold, WoW, Assassins' Creed Black Flag, GTA and not rape, but freely murder everything? Murder is objectively worse than rape and that goes perfectly well with the war/crime setting, but morality and a truckload of executives demand those elements removed from the entire market. Here you get to glimpse the raw talent of fans (and pervs sure) that complement a vacant position in the entertainment market