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"I guess no married men with kids are watching porn, getting it on the side or seeing hookers. Obviously letting yourself turn into a pig is a problem not matter who does it but if you still have a sex drive there is a least possibly a motivation to solve the problem and if you don't there isn't."
Who says that middle-aged women don't have a sex drive? Maybe they're just as tired of staring at the same old sad sack as men are of their wives.
But because of cultural conditioning about women's role in marriage (i.e., to be the moral "standard"), women don't seek out the extracurricular activities of pornography or paying some frisky young stud to make us feel attractive.
In that sense, marriage works very well for men. They know that women are less likely to cheat on them because of the societal morals, and that lets them off the hook to pay for porn and hookers.