The Bride Stripped Bare (Bride Trilogy #1) by Nikki Gemmell

A woman disappears, leaving behind an incendiary diary chronicling a journey of sexual awakening. To all who knew her, she was the good wife: happy, devoted, content. But the diary reveals a secret self, one who's discovered that her new marriage contains mysteries of its own. She has discovered a forgotten Elizabethan manuscript that dares to speak of what women truly desire, and inspired by its revelations, she tastes for the first time the intoxicating power of knowing what she wants and how to get it. The question is: How long can she sustain a perilous double life?