Channeling Torters

Reading this article about a Canadian woman charged with sexual assault for failure to disclose her HIV status, something occurred to me. The only way to insure clarity in matters like this would be to have a potential partner sign a consent. Given that most people don't consent others for a living, and the added discomfort of having that first STI talk with a new sexual partner [you all are having this talk consistently, right?] I'm not convinced this is a practical solution at all.