The Roommate by Rosie Danan
Clara Wheaton is the consummate good girl: over-achieving, well-mannered, utterly predictable. When her childhood crush invites her to move across the country, the offer is too good to resist. Unfortunately, it's also too good to be true.
Suddenly, Clara finds herself sharing a house with a charming stranger. Josh might be a bit too perceptive - not to mention handsome - for comfort, but there's a good chance he and Clara could have survived sharing a summer sublet if she hadn't looked him up on the internet . . .
Once she learns how Josh has made a name for himself, Clara realises living with him might destroy the reputation she's spent years building. But while they may not agree on much, both Josh and Clara believe women deserve better sex. What they decide to do about it will change both of their lives, and if they're lucky, they'll help everyone else get lucky too.