No worries. I'd say you covered it pretty well, but if you are trying to convince the Big 'L', I do not think you will be very successful. She tends to not accept that one can do something for a spouse for purely altruistic reasons, and has already stated that it is akin to 'Rape' if it is anything other than when she is 'in the mood'. So the 'L' with her.
Yes, we understand too well about obligations, both self-imposed and obligatory. She, however, simply cannot accept that along with the marriage vows come certain obligations If they were not there, why marry in the first place? When you marry someone, you are stating formally that certain obligations are accepted, not simply the ones you are most comfortable with. It is not simply to Love, Honor, and Cherish, but also to fill a need in each other. There is a reason that the Vows include "Forsaking all others", and sex is part of the bargain. I would really like to meet her (alleged) husband, and shake his hand. He is a much better man than I.