I don't have any commentary on this movie other than the fact that the movie BDSM isn't BDSM. You can get hurt. What we do, what I allow others to do, is dangerous. And while it will continue to be dangerous there are things you can do to do it safer.
I'm a leader of a Bottoms group for my local scene and I just helped to plan and host a Bottoms event at the local sex shop. So here are the highlights that you need to know if you want to try and play safe!
Use wrist cuffs
I know that most people think of "adding a little spice" by throwing in being tied to the bed post or throwing on a pair of handcuffs. Don't. For one, furry handcuffs...cliche. They also don't generally fit girls with bigger wrists, they're too tight. Silk ties that are self-cinching? Don't use those either.
Your median nerve that runs up the side of your wrist and down your thumb, can be in major danger with both of those. Yeah, I know from experience. I still can't feel a spot on my thumb. If you're new to BDSM and you don't know what to feel, chances are your top is new and doesn't know how to check in. If you feel tingling or coldness in your fingers, there is a problem.
Where to hit
Your body can be a whipping a post. That doesn't mean it has free reign. While it may be obvious that the butt is the best place to spank a naughty bottom, there are places to stay away from. Stay away from whipping or beating both kidneys and the spine; you need those to live. As far as the front goes, stay away from the collar bone up. Just ya know, common sense.
Don't you dare say you don't have limits! You do. It is okay if you don't know them but you have them. Using a safe word doesn't invalidate your experience or your time together but it may save your life.
You're going to need to take care of yourself. Generally you should have a bag of things ready, particularly, if like me, you don't play at home for whatever reason. I keep a blanket, a first aid kit, water, and my favorite Altoids handy. The candy helps the sugar drop, always stay hydrated, and the blanket helps with the fact that you're body might actually be in a stage of shock. It helps to stay warm and cuddled with the person who just beat the shit out of you.
Warning: The most sadistic tops can be the most cuddliest cuddlers.
And if you have questions...ask them. I want to tell you the answers so bad I can taste it.