The Sex Diaries is an adult romantic comedy that won't give you belly laughs, but will have you grinning wryly as you read about married couple, Phil and Annie, as they face up to some marital problems.  They consult a therapist, the odd-ball Fiona, and she recommends that they keep a ‘Sex Diary’ to keep a record of their relationship and give up sex altogether, which isn't what they expected. As they struggle to keep up with Fiona's increasingly bizarre demands things become complicated when Phil encounters an old flame and teacher Annie finds one of her pupils has a crush on her.