One well publicised book may add another tiny notch but sexual expression and sexual knowledge have been revolutionised by the internet. Explicit images have been available, together with information, on a mass scale and all sorts of people are tapping in and, in many cases, freeing themselves from physical chains.
Emotional relationships are changing fast and with them sexual ideas and how to express sexuality. Young people go through partners nowadays with hardly an upset because they are detached - the internet and technology have no doubt been prime movers.
I think some people are becoming greedy these days when it comes to sexual needs and gratification. 50 shades will influence some, titillate many and be meaningless to those who think lust can never hope to fill the shoes of love.