Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
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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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40% of people who are rejected in romantic love slip into clinical depression.
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Couples' personalities converge over time to make partners more and more similar.
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When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
Studies show that the risk of a “secret love” being revealed heightens romantic feelings for the partners, thanks to increased levels of phenylethylamine (PEA).
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Speed dating was invented by a Rabbi in 1999.
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The average person in their lifetime will spend an estimated 20,160 minutes kissing!
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