When a male gentoo penguin "falls in love" with a female penguin, he searches the entire beach to find the perfect pebble to present to her.
25
There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
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
Kissing an infection-free partner is good for your teeth!
141
Couples' personalities converge over time to make partners more and more similar.
235
The typical person spends about 600 hours having sex between the ages of 20 and 70.
234
Approximately 141 million Valentine's Day cards are exchanged worldwide every year.
104
Raj from the Big Bang Theory is married to Miss India.
11