Why is there so little scientific research about porn?

People sure worry a lot about porn. Are we watching too much? Is it creating sex-addicts? What would a Game of Thrones porn parody even look like? But for all the hand-wringing and proselytizing and pontificating that goes on, the fact remains that there is VERY little scientific research on porn and its effects. » 10/02/13 1:16pm 10/02/13 1:16pm