5. A non vasectomized subject must agree to use a condom with spermicide or abstain from sexual intercourse during the study. (No restrictions are required for a vasectomized male provided his vasectomy has been performed 4 months or more prior to Day -1 of Period 1. A subject who has been vasectomized less than 4 months prior to Day -1 of Period 1 must follow the same restrictions as a non vasectomized male).