Not a great moment of literrature, but not wasted time either!

I read volume 1 of the English version, my English fiance had advised me knowing that the work had become a bestseller in Britain.
He had warned me: a book to revive sexual ardor of women in their thirties ....
First 100 pages bring us back in our younger years, the beginning of the twenties, a romantic and piquant story.
And then comes THE proposal, I have found these very moved to the beginning or even outrageous, completely ridiculous ... And then the tone changes of the novel, the story becomes very intense and exciting with very detailed descriptions rather ...
But the author manages very well the situation:
it is no surely not a monument but literaire possibly a new phenomenon.
The story is simple, the sentences are short but action goes "straight to the point."
A novel intended for women who want a little spice in their lives but also men who seek to better understand what they want.