Chazal say that all your sexual drives and intimacy should be channeled towards your wife, which means that these desires and intimacy were created to bring a husband and wife to the ultimate connection. Throughout the day, you can practice thinking about your wife. Think about how much she does for you, what kind of attitude she brings into the home, anything that arouses positive and intimate feelings for her. When you do this outside the house, it helps you internalize it and those feelings are more ready available when you need them. Also at the appropriate times, try and remember how your wife looked when you were very attracted to her, and what you felt then. You can do this also when another woman grabs your attention - i.e. to immediately transfer the arousal to your wife.