jm - I don't entirely agree but I see your point. Your generalizations aren't happening in every household. For me, I'd say it is attraction. I cannot "initiate" with someone who I feel doesn't love themselves (let alone me). I do not want to use my wife for my own needs. If the stars align and we are in the right place in our relationship, maybe it'll happen once or twice a year now.

There is a good amount of sexless marriages out there. You just haven't experienced that phase yet - then you may understand. I'm not saying that you're wrong - just that your generalizations are not entirely wide-spread. And no, people shouldn't get divorced if they stop having sex. It's not a requirement of marriage.