SO doesn't want sex....

My SO and I have been together almost 2 years the first few months we were in a sex craze and everytime we met up we would have rounds of 3 or 4. After about the 4th month it started slowing down a little bit and I moved in. (He is now 32 and I'm 19) The whole relationship he has been addicted to porn and refuses to get rid of it, or compromise and enjoy it with me (which I'm totally willing to do). Now I'm at the point in this relationship where I have to continously get turned down and rejected just to get sex once or twice a month... At first I talked to him about it and he said his dick just wasn't working right but refused to go to any doctors and now it's just excuses 24/7... I've tried discussing with him for me to go to the doctor and get on one of the prescriptions to reduce or eliminate my sex drive because of the strain this has been putting on our relationship and he just yells at me and tells me to just stop having "attitude " with him by wanting sex. We are also ttc for the last 14 months....