ED can make most men, even at 75, feel like less of a man.  Chances are he's embarrassed about not being able to give you the attention you deserve and crave in the bedroom (or kitchen, livingroom, pool, wherever.)  It's likely got little to do with his attraction to you or his (perfectly normal) enjoyment of porn.  He needs to consult his doctor, possibly seek the opinion of a urologist, and maybe get some of those "little blue pills" to relight the fires in his loins.