It may have themes about rape torture Sexual sadism.
Dominance and submission. Does that mean I am going out and rape the first goth chick I see, No! One has to remember that for most of us this is FICTION (HELLO).
It is very nice to see couples with the gift of good communication and an open mind that can actually try some things that we all read about.
But I fear that for most of us if we even mention rope,handcuffs,blind fold, or the ubiquitous butplug. our significant other would running screaming to local authorities.

That is why Fiction lets us all have the freedom to explore new worlds, even if I dont have the balls to explore in real life.