This little flick deserves a 5 out of 10. I've never read the book, but there are plenty of likeable characters to carry you through the film. Sadly, the lead Claire was probably one of the less likable characters in the movie. The casting of Clair's best friend Liz was on-point, but Carter's friend Drew should've been taken out of the movie or rewritten completely. I couldn't tell if it's because the actor who played him was so bad or just that this character was so cliched that it was hard to watch everytime he showed up in the movie.
Claire, the obvious strong woman that she is, is neatly complemented by the beta-ish Carter. I suppose some people might find issues with that but opposites do attract, and not all women dream of getting down and dirty with those alpha-type, chauvinistic males.
My only other beef with the movie is the fact that after awhile, the sex seems to get in the way of the storytelling. Granted both leads are easy on the eye (with and without their clothes on), but with a book an author can take her time to explore the nuances of the characters, and when everything is condensed down to 90 minutes, there is only so much sex you can have before you run out of time to tell the actual story.
Plenty of curses throughout make this movie unsuitable for young children (especially since nearly all of them were uttered by a minor in the film), while there's no actual nudity, there's plenty of humping and self pleasuring to make this not safe for work.