You know I also agree that statement is awful. ( about the pregnancy) In life we all have choices. Our life is what me make of it.
Another thing is I am a woman and I know it would hurt terribly if my husband felt the way about me that you feel about your wife. Like saying she was not the most attractive person. You must find her attractive if you are always after her and feel entitled to sex. Unless for you there doesn't have to be attraction just a warm body. I guess what I am trying to say I am sure she can feel what you think of her. What would make her want to change for you? The pattern may stay the same because she knows deep down you hate everything about her. Here is another thing she may be thinking...her young days as a woman are now. Whast happens when she is much older and the kid's are grown? Expecially if she knows you feel only the kid's hold you together. I mean honestly look at your sitch closely and think about this....what is it about you that would make her want to be a better wife to you?
Curious to as you seem like sometimes you can be very insecure....what if she felt you were not attractive? What if that was the reason that she is not that into sex? Would it hurt you at all?
Try to think about things from her perspective and how she may be feeling.