There are always some limits. Even if it is extreme. The limit may be as extreme as "Okay but don't really KILL me or do something that could Kill me". That is a limit, albeit an extreme and assumed limit. You're talking about assumed limits such as are you into blood play, etc. I mean there are people out there who don't have these assumed limits. And we must all be aware. Without wants, choices or limits the sub just becomes a robot or doll.