Talk. Regular dates. Diverse dates. Prioritize each other above work and kids. Schedule each other. Adjust your other schedules for each other. Drop everything for the other when they need you NOW. Most of the time do yard, house and shopping chores together. Know each other. Cut each other slack. Give grace and forgiveness regularly. Flirt with each other. Compliments. Ditch jealously. Go dancing. Learn ballroom or martial arts or crafts or shooting or something together. Play sexy games. Have sex even when you don't feel like it. Try different things sexually. Choose to trust. Serve first. Learn constructive ways of conflict management: fight nice. Read and discuss the love chapter in Corinthians. Read a racy novel or sex advise book together. Pay attention to your looks (fitness, hair, clothes). Do the occasional marriage enrichment seminar or weekend when one comes up...even if you don't think you need it. Get counseling before, during and after you need it. Worship together (as family), find your right balance between doing things with whole family or friends and without them. Balance check book, pay bills and create budget as a couple. Make a sacrifice to buy each other little gifts. Touch non-sexually too. Stay in touch when you're apart with cards, notes, email, text messages, IM, phone calls, web cams or well thought out objects placed in advance. Don't take each other for granted. Know how much personal space you each need and give it to each other and guard it for each other. Speak well of each other to others. Figure out what makes each other tick and do it. Figure out what ticks each other off and don't do it.
It's not uncommon for a piece of information about marriage to get taken out of context in order to construct an argument whether it's true or not. Dr. Karen Sherman weighs in on a few of these out-of-context arguments.