There isn't a double standard. The intent and severity are obviously relative. You comparing something like Monster Girl Quest, which again, I cannot state enough, is advertised as a game in which you are purposefully and repeatedly raped, sometimes to death, often with the attacks of enemies in these combat encounters emulating this, all for the pleasure of the player, is different than something like Berserk, which uses rape as a traumatic and horrific plot device. Sex alone does not pornography make.