Depiction of S+M practices
The movie doesn't explicitly say it, but one could get the impression that all people who engage in such games must have some sort of damage, some unresolved trauma or daddy issues. Stefanson's character seems to have turned to S&M as a way of dealing with her rape experience. Whether or not it's just part of her mind games, one gets the impression that a sane, regular person would never engage in such practices.
That's a complete load. If there are such people, they must make up the smallest percentage of the S&M sub-culture. I know several people who are into S&M, and like me, they all didn't have some horrible experience in their past that somehow changed them. I for one have memories of liking things like bondage going back to my earliest childhood, long before I even knew what sex was. I eventually learned that most people don't tick that way. But some just do. There's nothing sick or sinister to it.