Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
34
You burn 26 calories in a one minute kiss.
605
Brain scans show that people who view photos of a beloved experience an activation of the caudate - the part of the brain involving cravings.
103
The average person will go on a date at least 100 times before they finally marry.
33
In Finland, Valentine's Day is called "Ystävänpäivä" which translates into "Friend's day".
4
Couples' personalities converge over time to make partners more and more similar.
235
Ten seconds of hugging a day increases levels of oxytocin, which can reduce blood pressure, thus cutting the risk of heart disease.
26
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