One in five long-term love relationships began with one or both partners being involved with others.
177
Couples' personalities converge over time to make partners more and more similar.
235
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
40% of people who are rejected in romantic love slip into clinical depression.
72
People are more likely to tilt their heads to the right when kissing instead of the left (65 percent of people go to the right!)
278
Close to 110 million roses (mostly red) will be purchased and delivered around Valentine's Day in the U.S.
88
The left ear is more responsive to words of love and emotion whispered into it than the right.
44
In medieval Italy, if a man was caught kissing a woman in public, he had to marry her whether he liked it or not.
456