Sex and the married man

I've been reading a lot of academic articles and books about competing visions of marriage and family law's rapid move from status to contract.  I just read a depressing pop culture example of the contractual premises on which modern marriage seems to be based.  The gist of the New York magazine article is that virtually all married men fulfill their sexual needs outside the marital relationship, whether through affairs or pornography.  It's a reality that we can't really talk about because we're not enlightened enough to dispel the myth of relationships.  Here's the concluding quote:

A relationship is a myth you create with each other. It isn’t necessarily true, but it’s meaningful. The key to that myth is that the other person is enough for you. You know in your head that another person isn’t enough for you. But if you don’t honor the myth, then it crumbles.

If I view marriage as a contract I enter in order to fulfill my needs, that quote is probably pretty accurate.  If I view marriage as a mutual self-giving that is part of a broader covenant (including God, children, and my spouse), the quote is outlandish.