Pure / Rose Cartwright.

"Rose Cartwright has OCD, but not as you know it. Pure is the true story of her ten year struggle with 'Pure O', a little-known form of the condition that causes her to experience intrusive sexual thoughts of shocking intensity. It is a brave and frequently hilarious account of a woman who refused to give up, despite being undermined at every turn by her obsessions and enduring years of misdiagnosis and failed therapies."--Provided by publisher.