The majority of men I know do watch porn! i'd forget the whole 'watching it together' thing, as he obviously likes to do this on his own.
as for spicing things up, how about role play? clearly he likes fantasies so why not find out what his are and go for that. dress up is always good!
tie him up, blindfold? Food? shall i carry on?
if you don't get turned on by something though then theres not much point in doing it. as with the porn, you'll just end up feeling silly.