Quote: She was annoyed and said something to the effect of "I really try to accommodate you." Accommodate! She doesn't seem to understand, and I have tried to communicate it before, that I get enormous pleasure from HER pleasure. If the lovemaking session is going to be one sided, I would actually prefer to go solo.
But if she's trying to do something nice for you, that can be a gift even if it's not tremendously pleasurable for her. I would accept the gift graciously if I were you, and perhaps even apologize for not being grateful when she has done this in the past. After all, I don't always feel good about doing chores, but it's an act of love, and I do them in order to be loving. She can't always feel the way you do about sex, but there's no reason to get down on her when she doesn't. (That last sentence could be read two ways, but I think I'll just leave it rather than fix it ;-> )