40% of people who are rejected in romantic love slip into clinical depression.
72
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
Wearing red increases attraction.
30
Couples' personalities converge over time to make partners more and more similar.
235
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
When dragonflies mate, their tails form a love heart.
22
A Korean man called Lee Jin-gyu fell in love with his large, huggable pillow and married it.
29