1) Mix up date night. The infatuation phase of relationships involves the spiking of a potent neurochemical cocktail, so it's really as though couples are under the influence," says sex and relationships counselor Ian Kerner, Ph.D., author of She Comes First. Luckily you can mix a similar dopamine and norepinephrine cocktail by simply doing new things with your man, according to research from the State University of New York at Stony Brook. What's more, when your body is physiologically aroused (think: slippery palms and a racing heart) you associate that feeling with whatever's in your environment... like each other.

2) See things a new way. The next time you and your guy have a fight, try to envision it from an outside, neutral perspective. Practicing this third-party assessment trick can help make you feel like you're back in the honeymoon phase, according to a new study from Northwestern University.

3) Schedule sex. The more often you have sex, the better. Period.
Regular sex makes both of you produce more libido-revving testosterone so you'll start going at it like rabbits even without a schedule. And couples that have regular sex are 65 percent more likely to be happy in their relationship, according to research published in the Journal of Sex and Marital Therapy.

4) Keep the mystery alive. If familiarity doesn't breed contempt, it
definitely breeds indifference. Studies have shown that attraction relies on constant and lasting discovery of your partner. And the strongest individuals build the strongest bonds, Kerner says. So avoid texting each other real-time updates on every aspect of your life and give each other space. Try scheduling some guys and girls nights out, or even separate vacations with friends, he suggests.

5) Get physical. Olivia Newton-John was right. Exercise makes you want to have sex. Exercise boosts your sex drive, mood, and clears your mind of clutter than can get in the way of any woman's O, Kerner says. And if you've been considering welcoming a little blue pill into your bed, consider a gym date instead: In one study of 31,000 men, researchers from the Harvard School of Public Health found that those who exercised vigorously for 20 to 30 minutes a day were 30 percent less likely to report erectile dysfunction than were couch potatoes.