<qa>  What is the method of contraception for men?22. Men must agree to use an acceptable method of contraception for themselves or female partners as listed above for the duration of the study. Men must agree to use a double barrier method of birth control and to not donate sperm during the study and for 1 month after receiving the last dose of study drug if not taking ribavirin of for 6 months after receiving the last dose of study drug if taking ribavirin. 