According to Match.com, here are some habits that keep couples happy:

Catch romance where you can -- It's difficult to sustain romance in our busy lives, so successful couples are romantic at unexpected times such as during their daily commute or while doing laundry.

Fight fair -- Learning to fight right is vital. Listening is a big deal. So is admitting when you're wrong and focusing on the issues and staying away from personal attacks.

Nurture your separate selves -- Developing individual interests allows for a richer life as a couple. By taking little "couple breaks," you gain a greater appreciation for your partner.

Take on a project together -- Doing new things together strengthens your history of shared experiences. Couples who take on adventures together get a sense of daring and accomplishment that can really kick up their chemistry.