I do appreciate your creativity. But it is not practical as you have no POS or POW. Who is going to validate how much porn you have watched? How is the validation done?
There is POW - the work is watching porn.
Validation is another issue, first we would have to define what's "watching". Having video playing in foregound? - this is easy to verify. Actually sitting in front of the computer and fapping, sorry, watching? - well, that's more complicated but still doable, there may be random moments when button appears and you have to click it or you may have to answer questions about content you watched - I used to take part in "pay 2 watch ads" and I had to watch movie trailers and then answer questions about them.