Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
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Couples' personalities converge over time to make partners more and more similar.
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Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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One in five long-term love relationships began with one or both partners being involved with others.
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A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
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According to the New York Times, a study conducted during the 1980's found that men who kiss their wives before leaving for work live longer, get into fewer car accidents, and have a higher income than married men who don't.
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