In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
Couples' personalities converge over time to make partners more and more similar.
235
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44
Two in five people in the world marry their first love.
270
In Korea, there's a man named Lee Jin-gyu who fell in love and married his life-sized Japanese body pillow (called a "dakimakura").
-2
A man's beard grows fastest when he anticipates sex.
239