He pushes and slaps OP because she refuses to watch porn with him, and the advice is that 'you both need to change' and 'he needs more sex'?
cowboyboots I am 
OP, he sounds like an arse.
I wouldn't want a porn film on in my bedroom. I wouldn't have gone quietly to sleep if my DH had decided to put one on anyway - I would have gone ballistic.
Mind you, he wouldn't have asked me. He wouldn't have put one on. That's because there aren't any in the house. And he certainly wouldn't have reacted by pushing and slapping me had any sort of argument broken out over anything else.
Maybe that's why, unlike you, I actually quite like having sex with him???
'All our married life he has resorted to name calling as a way of expressing his discontent that we don't have sex enough. When I try to tell him how I feel he minimises my feelings or disregards them completely'
Just a crazy idea, but a tiny bit of the reason why you can't be bothered with sex might be because of the above? Because you don't feel like being intimate and uninhibited with someone who treats you nastily and disregards your feelings?
I would go to counselling - but on my own first, because the way he treats you over this issue is abusive, so joint counselling is a no-no. By all means address the sex - but maybe also ask yourself whether you like, love, and respect him anymore - and if the answer is no, whether you think (given your knowledge of his personality) there is hope for him as well as you to work properly on the relationship and rebuild it into something positive. Given what happened last night, my money at the moment would be on 'no'.