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
In 2011, archaeologists discovered the skeletal remains of a Roman couple who have been holding hands for 1,500 years.
81
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
In Korea, if you do not receive any gift on Valentine's day then all the singles go to Korean restaurants and eat black noodles to celebrate (or mourn) their single status.
27
One in five long-term love relationships began with one or both partners being involved with others.
177
Wearing red increases attraction.
30
Historically, sweat has been an active ingredient in perfume and love potions.
309