There is nothing wrong with viewing porn and pleasuring yourself. A lot of couples will rent a naughty video and watch it, have sex while its playing (do what the porn stars do) and its a great way to spice up the relationship. If your not around for whatever reason and he wants to look at some porn and wank it...count yourself lucky! because it could be worse...he could be out looking for a play date.

Now if he doesn't want to have sex with you only watch porn and jerk off all by himself there is obviously a huge problem.