In marriage we have a duty to God, our spuses, the world, and future generations. But we are sinners. A husband and wife need to acknowledge that when the Bible speaks of fools, it is not just speaking about other people, but about them as well. Even the wisest among us has moments of folly. So God gives us spouses to serve as wise friends by praying with and for us, attending church with us, speaking truth, and providing Scripture along with good books and online classes, lectures, and sermons to nourish fruitfulness in our lives.
While it only takes one spouse to be friendly, it takes both spouses to be friends. When both spouses are unfriendly, the marriage is marked by conflict and coldness. When one spouse is friendly and the other is unfriendly, the marriage is marked by selfishness and sadness. But when both spouses each make a deep, heartfelt covenant with God to continually seek to become a better friend, increasing love and laughter mark the marriage.
Marriage includes a spouse, and often children. But the goal, center, and purpose of marriage is not self, spouse, or children. The ultimate goal of marriage and family is the glory of God. Only when marriage and family exist for God's glory - and not to serve as replacement idols - are we able to truly love and be loved. Remember, neither your child nor your husband (or wife) should be who you worship, but instead who you worship with.
Don't cohabitate. Don't fornicate. Don't look at pornography. Don't create a standard of beauty. Have your spouse be your standard of beauty. This is one of the great devastating effects of pornography: you lust after people and compare your spouse to them. It's impossible to be satisfied in your marriage if you don't have a standard that is biblical; that standard is always your spouse.