Fascinating facts about love - Did you know that humans aren't the only animal that practices monogamy? Or that in ancient Greece, love was expressed by throwing apples at somebody? Find out some fun and unexpected facts about love!

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Here's looking at you - A study published in the the International Journal of Psychology showed that two people in love can synchronize their heart rates by looking at each other intently for three minutes.

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Cuddles - Various studies indicate that giving and receiving cuddles provokes the same neurological reaction as painkillers.

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Attraction - One scientific study concluded that a beautiful face is more effective in attracting a partner than a great body.

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Productivity - A study conducted by Henk van Steenber and colleagues at Leiden University and the University of Maryland concluded that a person in love is far less productive.

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Obsession - Psychiatrist Donatella Marazziti conducted a study in which she observed that being in love and having obsessive compulsive disorder are practically indistinguishable in biochemical terms.

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Fear - Philophobia is the fear of love or emotional commitment.

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In the name of love - As a tribute to his deceased wife, Pedro Martin Ureta, an Argentine farmer, planted a field of eucalyptus trees in the shape of a guitar. Since his wife passed away in 1977 he has planted more than 7,000 trees.

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Declaring your love - In ancient Greece, one way to declare your love for someone was to throw apples at that person.

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Online encounters - According to the Pew Research Center, nearly 23% of people that meet online end up getting married.

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Three little words - A study published in the Journal of Personality and Social Psychology showed that men are more likely to say "I love you" before women.

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Erotomania - Erotomania is a delusional disorder in which a person believes that a famous person is in love with them.

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Different words - The Greek language has four words for love. Agape: intimate love; Eros: sexual love; Philia: love between friends; and Storge: love or affection for family.

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Countless words - Sanskrit, the ancient language of Nepal and India, has 96 words for love.

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Hormonal - During an orgasm, the brain releases oxytocins, which is one possible explanation of why humans like to cuddle and hug after the act.

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Effect of oxytocin - This molecule plays an important role in commitment and empathy. It is thought that oxytocin has a more significant effect on women.

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Getting over it - According to a study carried out by Helen Fisher at Rutgers University, getting over a break-up is similar to getting over a drug addiction. Brain scans carried out on participants getting over a relationship were similar to those who had given up drugs.

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Soul mates? - A survey carried out by AOL Living polling 35,000 married women showed that 52% of women did not believe that the men they married were their soul mate.

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Photographs - A study from Stanford University concluded that looking at a photo of a loved one can reduce pain by up to 44%.

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Long-term suffering - According to a study conducted on over 5,000 participants from 96 different countries by Binghamton University and University College London, the pain of a failed relationship affects men for longer than women.

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Differences - A study published in the Personality and Social Psychology Bulletin concluded that men are more likely to be attracted to women who are nice to them. In contrast, women don't show this tendency in relation to men who are nice to them.

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Monogamy in the animal kingdom - It's not just us humans who search for a life partner. Wolves and swans stay with one partner for life.

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Opposites attract - Various scientific studies show that couples who share similarities tend not to last. As the old saying goes, opposites attract.

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Holding hands - Several scientific studies show that holding someone's hand can relieve stress in tough times.

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Butterflies in your stomach - Butterflies in your stomach are real... kind of. This feeling is caused by an adrenaline rush in reaction to the situation.

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Sweat - Believe it or not, but sweat was one of the main ingredients in ancient love potions.

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Conditions - Hypopituitarism is a rare condition that doesn't allow people to feel the joy of love.

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Symmetrical face - Various studies conclude that men and women with symmetrical faces tend to have more choice when it comes to finding a lover. Statistically, men with symmetrical faces begin their sex life four years before those with asymmetrical faces.

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One and only - Plato's theory states that humans started as hermaphrodites with four hands, four legs, and two identical faces. These beings tried to give up their gods and as punishment were divided in two, creating man and woman with an innate desire to search for one another.

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