Pray that he will begin to listen and understand the problem. Your letter doesn't indicate that you've tried to talk with him about this. Don't expect him to read your mind or somehow automatically know how to change. Be prepared to verbalize your needs, feelings and desires. Think about how you are expressing them now.
Feelings have a way of coming out, often nonverbally.
Maybe your husband will catch on if you try a different technique for expressing your feelings. It often helps to use first-person statements or emotional word pictures. As you express your feelings, find out about your husband's feelings, too. Don't assume that he intends to be unfeeling or unkind. Sometimes what comes across as sexual selfishness may be something else, such as fears or frustration, in disguise.