SEATTLE (Reuters) - An Oregon woman whose doctor convinced her that he could cure her lower back pain by having sex with her is suing him and his medical clinic for $4 million, according to legal documents obtained on Monday.

The doctor, Randall Smith, who was 50 at the time, was stripped of his license and sent to jail for 60 days last year for charging the state's Oregon Health Plan $5,000 for his 45-minute "treatments" involving the woman.