Dear Chasid...
Viewing porn turns all women into objects of lust. This is the very opposite of what relations in a Jewish marriage are meant to be. The "lust" aspect of sexual desire was created by G-d to cause a man to seek out a woman and take her for himself. Once a couple is married, the "lust" aspect of sex should be relegated to the side and should no longer be a dominant aspect of the relationship between the two. They have dedicated themselves to each other, and when they are together, they should be cultivating an emotional bond through the sharing and sensuality of intercourse. Sex is a "sacred moment" of closeness between the two of them. This is also perhaps why Chaza"l prohibited having relations by day. Firstly, because one may see something about his wife's body that may turn him off, and on the other side of the coin, by seeing his wife's body he is fueling his lust instead of focusing on the true sacredness of the moment.

A man who insists to make "lust" the most dominant aspect of his relations, is losing out on the true connection and closeness that martial relations should cultivate, and ultimately his marriage is likely to fall apart. As his wife has children and her body changes, and/or as she gets older, he will loose interest in her and he will never be able to lead a normal marriage life. A relationship built on "lust" quickly fades away. Also, by fueling the lust through his relations and not focusing on building the emotional bond with his wife, he will continue to be pulled after the other women he sees on the street, and will transgress all the time the Issur D'eoraysah of "Lo Sachmod". Lust is truly a poison, and the nature of lust is that "the more you feed it, the more you need it". One can never get enough of lust. In the end, either we win it over or it wins us over.

Just one last thought. Even with a strong resolve, one should never trust themselves in these areas and should get a strong Internet filter for their computer to help them through moments of weakness. And never stop davening to Hashem to save you and your offspring from what is perhaps this generation's biggest test!

How's the commute you mentioned last week, going?