This is a tough yet very common issue between couples. First off- good for you for reaching out. I can only imagine that you have been beating yourself up over not feeling attractive as you said. I may be restating what others have offerred but here are some questions and thoughts that jump out at me.
-definately communicate how you are feeling to him because he may be in the dark about how much it is bothering you. Let him know that sex is important to you in a relationship.
- are you willing to seek counseling together? does he feel that his internet porn stuff is taking up too much time and replacing your intimate time?
- how are you feeling about yourself? I only ask because it's so easy for women to blame themselves. Focus on you and doing what you need to feel good.
-did you fall into a "routine"? Maybe exploring other options such as toys,viewing porn together might break it- if you are comfortable with that.
- I think the main thing is to speak to him really. In the meantime