Some more thougths on the desire - arousal aspect of the relationship, and yes these are all things I have discussed on here before...
The problem that I have in my relationship with the desire - arousal aspect is that my W does get desire AFTER arousal, what this leads to is either me getting her aroused to the point where the sex becomes about her (hey I love to give to but...) and she has an O and wants to sleep / relax / etc. or it becomes about me, with her not too interested (pity sex). What my R is lacking is the desire, or even call it foreplay from her as part of our ML.