To answer the question posed at the beginning, it is unlikely to be the case, because snuff involves the ending of a story/character. If you do so to the player character, it is considered a "Game Over" and a loss for the player. This results in having such content very difficult to include for the player character. If one tries to include the content via the NPCs, said systems are usually considered part of the combat system for said game, which results in neither a bat of the eye, or a very sexual context for the event. I mean, you could mod a hack&slash game so that all the character models are nude, and that would technically be considered a snuff game, but would most people consider it as such?