This supposed "problem" is inane. If any guy says he's not looking at porn, he's lying - and women need to let it drop. The only way this is an issue is if the woman needs to cause chaos and disrupt a relationship because she can't stand actually being close to someone.
It doesn't matter what YOU, the wife, would do - you didn't marry yourself. You married a guy. This is how we function. In fact, you should be worried if a guy is not looking at porn.. because that's when he probably is out cheating.
Of course this stuff happens when you're not having sex regularly.. the male biology is vastly different than the female's, and the pipes need to be cleaned all the time.
No, this shouldn't be a conversation, women - the schedule of this is the very definition of his space, his time.. and to think that it is something worthy of your thought is both intrusive and demanding. If you want to push him away and get him to check out of the relationship completely, go right ahead and try to control this. If you want a happy husband willing to be emotionally present, you'll let this drop. Choose one.