From what I'm reading I think that the two of you might benefit from some type of couples counseling book. I hate to insert stereotypes but it's very atypical for a male to not be attracted to a woman if he is straight. Regardless of what that woman looks like.... And with you being curvy as you have described yourself it's even harder to believe that you would not be attracted to you.

That's why I'm suggesting maybe there's something that needs to be communicated between the two of you that is not being communicated. For example, he could have some trauma, secret, fear, something has to be causing this mindset.