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
Two in five people in the world marry their first love.
270
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
When dragonflies mate, their tails form a love heart.
22
Historically, sweat has been an active ingredient in perfume and love potions.
309
Couples' personalities converge over time to make partners more and more similar.
235