Many times I've thought to myself the next time she initiates anything I'm going to say "I'm really tired - please just let me sleep" or "please don't touch me, that tickles" or "the girls have been crawling all over me all evening, do you think I want you to do the same" or "I'd rather not - I just don't feel very close to you right now" or "please just leave me alone" - just so she'd know how it feels. But like you said, when you're starving you take anything you can get. I honestly think I could be miserably ill and I still wouldn't turn her down. That just makes me feel even more like a fool!
By the way, nice writing! (to hunger for our bodies and spirits to meld together in ardorous love, etc.). You should do romance novels.