I think it will be used to squeeze guys with less intelligence or perhaps guys who are naive for a lot of cash. I do not think the rape problem which is already pretty well addressed by laws is worth 'solving' by handing women a tool to blackmail guys. But then again if people truly want positive consent, it's actually the only way to do it. In that light recent changes to rape laws across the world to things similar to positive consent can be viewed as implying that this system should exist.