Take Five: The Bliss Factor

10. Relive your dating days. "Research has shown that having couples re-create experiences they shared when they first fell in love can actually help the relationship as much as certain types of marital therapy will," says Ickes. Write down five things you each loved doing when you began dating—dining by candlelight, browsing bookstores, working out together—and start incorporating them into your life again.

11. Smooch for 12 seconds, twice a day. "Passionate kissing will keep the juices flowing forever," says Cadell. "Kissing is so intimate because you're face to face and looking into each other's eyes." It also stokes your romantic fires because it's reminiscent of the beginning of your relationship, when you couldn't stop locking lips.

12. Think about sex—and only sex. "If you're worried about your mile-long to-do list or what your mother said on the phone today while you're getting intimate, your sex life may suffer," says Zoldbrod. So, before things heat up, take a few minutes to jot down all of your thoughts and concerns from the day. "This releases what's stressing you out and allows you to consciously give yourself permission to focus on more pleasurable activities," she says.

13. Reminisce. Spend a few minutes looking at old photos or reading cards and notes you wrote each other when you first started dating. Sure, it's a little sappy, but it will show you how far you've come and bring back the giddy vibes from those butterflies-in-the-stomach days.

14. Stock up on Post-its. These sticky pads are lifesavers at the office, but they can also keep things humming along at home. Leave each other little notes on the bathroom mirror, in his or her wallet or on the dashboard of the car. You'll smile—and feel a special little thrill—when you find them.

15. Take a whiff. "Scents stimulate the limbic system, the part of the brain that affects your mood," explains Alan Hirsch, M.D., neurologic director of the Smell & Taste Treatment and Research Foundation, in Chicago, Illinois. One of the foundation's recent studies found that the most powerful odor for male sexual arousal is a combination of pumpkin pie and lavender. Husbands should stock up on licorice and cucumber, since women respond best to these scents, according to the study.