take into fact that he is 50 and might need more stimulation visually but is there anything you to turn him on, can do to take his eye off the porn?, experiment, try different things, No your not an object and you do have feelings. If trying different things dont work and your not happy then its time to say adios moochacho............
How does this make you feel? Emotionally, no-one knows that but you.
Personally I'd say if its something the two of you dont enjoy together then a talk over the matter is in order! good luck