9. Big
Plot: When a boy wishes to be big at a magic wish machine, he wakes up the next morning and finds himself in an adult body literally overnight.
Porno Plot: If Big were a porno title, it could easily keep the same plot. There would just be one minor, or major depending on how you look at it, difference. Instead of the film focusing on the themes of aging and childlike innocence, we would see a child in a man's body obsessed with the progression of his now large anatomy. From there, the possibilities would be endless (and a little sick). I'm surprised the producers even got the title of Big. I would've been sure some 70s-moustached producer with gold chains would have already owned the rights to the title.