Kissing releases masses of oxytocin, a "love potion" that helps couples bond and feel more attracted to each other.
13
The typical person spends about 600 hours having sex between the ages of 20 and 70.
234
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
Holding hands with someone you love can alleviate physical pain as well as stress and fear.
26
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
A poll has found that computer 'nerds' make the best lovers, with 82 percent of IT geeks claiming they put their partner's pleasure above their own.
464
Couples' personalities converge over time to make partners more and more similar.
235