Thanks for the welcome, but I actually did not cover all the bases. There is one more that I can think of: The child falsely accusing the adult. Doesn't happen often, but it does happen. I know of one case personally. The teen-age step-daughter enraged at her step-father. Accused him of crimes that would come under the catagory of "Leud and Lacivious Behavior". Something that really cannot be proved or disproved. Comes strictly under the "he said...she said" heading. She waited 4 months to recant her testimony, and enjoyed every minute! Thought it was the funniest thing ever. Of course, he was not convicted and does not have to register. But the arrest will stay on his record. He had no record for anything more than a traffic ticket before that. How many times is the charge made as a revenge thing? Especially in situations like this where there would be no physical evidence?
To what "anti-rape device from South Africa" device are you referring? I've never heard of it. But the camera phone sounds like a good idea.