Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Couples' personalities converge over time to make partners more and more similar.
235
Two in five people in the world marry their first love.
270
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
A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
464
Kissing an infection-free partner is good for your teeth!
141
You burn 26 calories in a one minute kiss.
605
A man's beard grows fastest when he anticipates sex.
239