50 shades of grey..

So I have not read the books.. But my friend swears anyone and everyone should! She's obsessed. But anyway I seen the trailer online for the movie and I watched it and was totally confused so I went online and read a couple articles for the plot of the movie and what it's all about... 
​What in the hell. This movie or book sounds weird.. What's the point? Is it about crazy sex where they beat each other? It doesn't sound intriguing to me at all. I wanna know everyone else's opinion on the book/movie.