My 30 year old daughter has downloaded it on to her Kindle and told me not to bother reading it, as it's total rubbish. She says the idea of S and M is sick-making, and she has continued to read the book so she can laugh about it with her friends. This tidal wave of interest seems to be about 'if you haven't read it, you're not in our clique.' My other daughter says she can't be bothered reading it, and she won't have any erotic literature in her house.
Neither of them think that it is creating an interest in aggressive or deviant sex amongst young people - they regard it as a laugh, and a good conversation topic. Neither of my sons (32 and 37) want to look at it - they like the banter about it, though, and delight in winding up their sisters, saying 'so much for feminism, then!'
I have things like the works of D H Lawrence on my bookshelves, and none of my children, when growing up, noticed that Lady Chatterley's Lover is contained within, and clearly written on the wide spine of the book. Teenagers will always look for something they think we wouldn't approve of, just to see what the concern is. Isolated teenagers who aren't in touch with their peer group, or who don't have an outlet for curiosity and interest in sex, are the ones who would concern me, but not from this book - from the internet.