This is going to be a never-ending source of frustration for you hon. I don't mean to sound negative but everything you are going through I have been through. It's a cycle. You feel frustrated, you talk about it, for a while you feel better and then something sets you off, you get frustrated, you eventually fight or talk about, the whole cycle starts again.
I think BC is spot-on that you guys are not sexually compatible. Sexually compatibility encompasses a whole range of things, not just whether you both have similar libidos. It means your outlook on things associated with sex, including porn, styles of sex, romance vs just 'f%^king' etc. Yes the whole 'most guys look at porn' argument exists and it is easy to say 'oh well I don't mind so long as it isn't impacting on the relationship' but have a think about it. It may not be impacting on your sex-life, in terms of him still wanting to have sex with you and desiring you, but it is impacting on your relationship because it is something that you are not comfortable with and you are continuously frustrated with his retorts to 'just deal with it'. This is what you need to evaluate. I do wish you luck in becoming more used to it and being able to just deal with it as he suggests but it is difficult. Just be careful not to sacrifice too much of yourself or your values when it comes to sex. Don't feel you have to stay if the relationship isn't making you safe, secure and happy.
Some people are drains and some are radiators... Keep clear of the drains and hug the radiators!