Sea otters hold hands while sleeping so they don’t drift away from each other.
104
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Two in five people in the world marry their first love.
270
Wearing red increases attraction.
30
Falling in love raises levels of nerve growth in a person's brain for about a year and can improve their memory.
39
You burn 26 calories in a one minute kiss.
605
Every year around 1 billion Valentine cards are sent. After Christmas it's a single largest seasonal card-sending occasion.
14