I assume you are
a) single
b) married, but your wife has no idea that you think this way
c) married, with a wife who is petrified of you
What you are asserting is that a wife must always be willing to have sex with her spouse. What I can tell you with absolute certainty is this: if my husband (and I'll bet I speak for a lot of women on this forum) tried to force himself on me when I was, say, a week or two post-partum I would have kicked the living $hit out of him. Excuse my language, please. And that is just one example.