I think desire is a natural occurence in a relationship but it does have it's ups and downs for us based on all kinds of things. Desire is "based on all kinds of things", in other words, you just made desire CONDITIONAL. THis means you just made meeting your husbands needs CONDITIONAL upon what he does to MERIT the meeting of his needs. I assume then that he ALSO gets to meet your needs CONDITIONALLY, and then you will end up stuck, because he can not meet your needs since you can not meet his. Unless of course you expect that he must meet your needs UNCONDITIONALLY, while you get to meet his conditionally.