I just wanted to throw this out there....
I saw the other day on Oprah I think-not sure, it takes 5 years to get back to normal after having a child!!! 5 years!!!!!
Wanting once a day, even when you know your wife does not agree + saying it is the #1 thing in your life is not showing love. That is an addiction. If my husband treated me that way, I would feel used, not loved. (We are not animals... We are able to control ourselves. For some reason your husband seems to be wanting to put his needs before yours.) Sorry that it is a cliche, but I think counceling might be a good idea.
I am also wondering if your dh, based on tv and talk among men, has somehow come to the conclusion that once a day is normal. For 99% of marriages, it is not.