Click for bigger     "They should do it as a straight-up porn film. That would be so good..." chuckels Robert Pattinson, speculating on a potential - but rather less chaste - future reboot of Twilight. While he may be joking about new beginnings, the billion-dollar vampire franchise is at its end with The Twilight Saga: Breaking Dawn - Part 2 (to give it its full title) and Pattinson is on…