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Though love isn't going to be replacing modern medicine any time soon, it could come in handy if you ever find yourself in some serious pain. One study conducted by researchers at the Stanford University School of Medicine found that the warm and fuzzy feeling creates the same response in the brain as painkillers (without any of the harmful potential side effects).

When you and your spouse gaze into one another's eyes, what's happening behind the scenes is that your heart rates are syncing up, according to research from scientists at the University of California, Davis. When they analyzed 32 heterosexual couples who sat facing one another for three minutes, the researchers found that their heart rates were nearly identical, and they speculate that this occurred because of the strong link between partners on both an emotional and physical level.

Feeling stressed? Hug it out with the person you love. One study conducted by psychiatrists at the University of North Carolina found that when couples embraced, they had increased levels of oxytocin—the hormone responsible for lower stress levels and mood boosts.